ZA200601320B

ZA200601320B - Guard device for escalator handrail

Info

Publication number: ZA200601320B
Application number: ZA200601320A
Authority: ZA
Inventors: Kim Jong-Sook
Original assignee: I & K Internat Co Ltd
Priority date: 2003-08-20
Filing date: 2006-02-14
Publication date: 2007-05-30
Also published as: AP2006003516A0; CN100441427C; KR200331931Y1; CN1819930A

Description

CERAMIC CATALYST HAVING IMPROVED

ABSORPTION AND DISINTEGRATION PROPERTIES

FOR VAPOR PHASE COMPOUNDS AND PREPARATION

METHOD THEREOF

(1]

Technical Field

[2] 31 The present invention relates to a ceramic catalyst having absorption and disin- tegration properties for vapor phase chemicals and a preparation method thereof. In particular, the present invention relates to a metd oxide contained porous ceramic catalyst capable of absorting and disintegrating vapor phase chemicals which is obtained by impregnating a water-sduble metd sat into ceramic materia and then firing to disperse a metal oxide therein and a preparation method thereof.

[4]

Background Art

[5]

[6] Conventiona catdysts for disintegrating vapor phase chemicals induding bad- smeling materids have been able to perform their functions only at a high temperature of more than 100 ° C, and materids to which the catalysts can show their disin- tegrating function were kmited (JP 2001-38207 and US 6,344,987). Accordingly, it was impossible to utilize the conventiond disintegration catalysts for disintegrating bad-smeling materids in the actual life or for disintegrating industrial vdatie materidls at a ow temperature of less than 100 ° C. In order to utiize such catalysts, the temperature of the vapor phase compounds have to be maintained at more than 100 ° C or the vapor phase compounds have to be artificially heated so as to have a temperature of more than 100 © C. As the result, many problems have occurred, for example, the applcaliity of the catalyst was very Emited, and that it was very expensive to disintegrate vapor phase chemicals. (71

Disclosure of Invention Technical Problem

9] Therefore, an object of the present invention is to provide a ceramic catalyst having absorption and disintegration properties for vapor phase compounds even at a bw temperature of less than 100 ° C regardless of an assistance of ight, and a preparation method thereof.

[10] To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a porous ceramic catalyst containing a metd oxide capable of absorbing and disin- tegrating vapor phase chemicds obtained by immersing water-soluble metd sdt in a porous ceramic materi, firing, and then uniformly dispersing a meta oxide in the ceramic materia, and a preparation method thereof.

[11] The foregoing and other objects, features, aspects and advantages of the present invention wil become more apparent from the folowing detailed description of the present invention when taken in conjunction with the accompanying drawings.

[12]

Technical Solution

[13]

[14] Reference wil now be made in detail to the preferred embodiments of the present invention, examples of which are Hlustrated in the accompanying drawings.

[15] The present invention relates to a ceramic catalyst having absorption and disin- tegration properties for vapor phase chemicals and a preparation method thereof. In particular, the present invention relates to a metd oxide contained porous ceramic catdyst capahle of absorting and disintegrating vapor phase chemicds which is obtained by impregnating a water-sduble meta sdt into ceramic materid and then firing to disperse a meta oxide therein and a preparation method thereof.

[16] A porous ceramic catalyst containing a meta oxide of the present invention is a non-photoassisted room temperature catalyst capatie of disintegrating vapor phase organic compounds at a low temperature such as an ordinary room temperature regardless of light, and can easy disintegrate organic vapor phase compositions without additiondly irradiating Eght or without additionaly heating temperature up to a high temperature.

[17] The present invention provides a porous ceramic catdyst containing a meta oxide capahie of absorting and disintegrating vapor phase compositions at a ow temperature, obtained by mixing a mixture of 70 to 99.5 wt% of a porous ceramic materid and 0.5 to 30 wt% of a water-soluble metal sdt with water, then shaping, drying and firing, to make a metd oxide derived from the meta sat uniformly dispersed in the ceramic materid. The porous ceramic catalyst of the present invention may dso be obtained by further adding a combustible materid to the mixture of the porous ceramic materid and the water-sdutie metd sdt and mixing, wherein the added amount of the combustitie materia is 70 wt% or less based on the totd weight of the mixture of the porous ceramic materid and the water-sduble metal sat. The porous ceramic catalyst of the present invention may dso be additionally coated with meta sdt aqueous sdution in which 1 to 20 wt% of a water-sduble meta sat is dissolved.

[18] Further, the present invention is to provide a preparation method of a porous ceramic catalyst containing a meta oxide comprising the steps of:

[19] (a) mixing 70 to 99.5 wt% of a porous ceramic materia with 0.5 to 30 wt% of a water-sduble metd salt

[20] (b) kneading the obtained mixture with water and then shaping as a desired shape; and

[21] (c) sufficiently drying the shaped material at an ordinary room temperature, and firing at a temperature of 400 ° C to 1,400 ° C to make a metd oxide derived from the meta sat uniformly dispersed in the shaped materia.

[22] Further, the preparation method of a porous ceramic catdyst may comprise the step of additionally mixing the mixture of the porous ceramic materi and water-sduble meta sdt with a combustitie materid, wherein the amount of the combustible materia is 70 wt% or less based on the weight of the mixture of the porous ceramic materid and water-soluble metd salt.

[23] After the step (c), the preparation method of a porous ceramic catalyst may further comprise the step (d) of impregnating the obtained porous ceramic catalyst containing a meta oxide into metal salt aqueous sdution containing 1 to 20 wt% of water- sclution metd sdt for at least five minutes, sufficiently drying, and secondarily firing at a temperature of 40 0° C to 1,400 ° C, to coat the porous ceramic catalyst containing a meta oxide with a metd oxide.

[24] The porous ceramic materia used in the present invention is preferably a powder form, and may be one or more materids selected from a group consisting of porous dumina (Al 0) day, kadiin, fint pebble, pottery stone, feldspar, veinstone, zedlite, bentonite, duminum compounds (e.g., duminum sulfate), a fired materid containing at least 10 wt% of porous dumina and at least SO wt% of porous silica (SiO 2

[25] The water- sdutie metd sdt used in the present invention may be one or more materidls selected from a group consisting of water-sduble cobelt salts [e.g., Co(C HB

0)} magnesium sdts [e.g., Mg(C JO) strontium sdts [e.g., SIC JO) 1 barium sdt [e.g., Ba(C HO), vanadium sds [e.g., V (80) 1, chrome sdts [e.g., Cr(NO Jb manganese sdts [e.g., Mn(C HO) ferric sdits (e.g., FeCl p nickel sdts (e.g., NiSO, ), copper sdts (e.g., CuCl ), zinc sdts (e.g., ZnCl p cadmium sdts [e.g., Cd(C HO) tin sdts (e.g., SnCl > tthmuth sdts (e.g., BiPO > sodium sdt [e.g., sodium hydroxide(NaOH), sodium sulfide(NaS), sodium sulfate(Na SO), sodium sulfite(Na,

SO). sodium iodide(Nal)], cdcium hydroxide [Ca(OH) Jb Ethium hydroxide (LiOH), potassium hydroxide (KOH) and barium hydroxide [Ba(OH) is More preferatly, the water-sdutie meta sdt may be a water-sduble cobt sdt [e.g., Co(C JO) ora mixture of the water-sclutle cobalt set with one or more sdts selected from the group consisting of magnesium sdts [e.g., Mg(C J.0)L strontium sdts [e.g., SI(C JO) barium sdt [e.g., Ba(C JO) vanadium sdits [e.g., V.(80)], chrome sdts [e.g.,

Cr(NO) J, manganese sdts [e.g., Mn(C JO) 1 ferric sdits (e.g., FeCl p nickel sdts (e.g. NiSO), copper sds (e.g., CuCl D2 zinc sdts (e.g., ZnCl), cadmium sats [e.g.,

CACHO) tin sts (e.g., SnCl > hithmuth sdts (e.g., BiPO > sodium sdt [e.g., sodium hydroxide(NaOH), sodium sulfide(N aS), sodium sulfate(Na SO ), sodium sulfite(N: a SO), sodium iodide(Nal)], cdcium hydroxide [Ca(OH) Jb Ethium hydroxide (LiOH), potassium hydroxide (KOH) and barium hydroxide [Ba(OH) J

[26] The above water-sduble mets sdts have a characteristic to be changed into a cor- responding meta oxide, when fired at a temperature of 400 ° C to 1400 ° C. Ac- cordingly, by mixing the water-sduble meta sat and a porous ceramic materid with water and then firing the mixture at a temperature of 400 ° C to 1400 ° C, a ceramic catdyst in which a metal oxide is uniforndy dispersed in ceramic layers can be obtained.

[27] In the present invention, a combustible materid may be optiondly used. The combustitie materid is preferably a powder form, and can be completely disintegrated into water, carbon dioxide and so forth, by being reacted with oxygen at a high temperature. The combustible materid may be a powder type hydrocarbon compound consisting of carbon, hydrogen and oxygen, such as adipic acid, melanin, sugar, stearic acid, paraffin, etc.; a powder type carbon compound such as carbon Hack, fine cod, graphite powder, etc.; or a mixture thereof. The combustitie materid is completely disintegrated into water and carbon dioxide to form a porous ceramic layer having a uniform pore, when mixed with a ceramic material, and fired at a temperature of 40 0 °

Cto 1,400 °C.

[28] The vapor phase compounds which can be absorbed and/or disintegrated by the ceramic catalyst of the present invention indude dl odorous materids, and especialy indude ddehydes, dcohals, amines and benzenes.

[29] Hereinafter, a preparation method of the ceramic catalyst having absorption and disintegration properties for vapor phase compounds according to the present invention wil be flustrated in more detail.

[30] Step (a) 70 t0 99.5 wt% of the ceramic materid in a porous powder form is mixed with 0.5 to 30 wt% of the water-sduble metd sat so that the totd weight can be 100%. When the amount of the water-scutle metd sat is less than 0.5 wt% , the amount of the meta oxide derived therefrom is deficient, whereby the disintegration ability of a final product is greatly deteriorated. When the amount of the water-saluble meta sdt exceeds 30 wt%, the derived meta oxide is unevenly dispersed in ceramic pores, whereby the disintegration akifity is deteriorated. Most preferatly, 0.5 to 10 wt% of the water-sduble meta sat may be used.

[31] In order to form a porous ceramic layer having more uniform pores in size and dis- tribution, a combustible materid may be added to and mixed with the mixture of the ceramic materid and the water-sduble meta sat, in the amount of 70 wt% or less based on the weight of the mixture. When the amount of the combustible materid exceeds 70 wt% of the weight of the mixture of the ceramic materid and the water- sdlutle meta sd, the formed pores are too large or can be destroyed. Most preferably, to 65 wt% of the combustitie materi is used.

[32] Step (bx Then, the mixture of the ceramic materid, the water-sduble meta sat and the optiond combustible materid is kneaded with water and shaped into a desired form. Preferably, water is used in the amount of 50 to 250 wt% based on the totd weight of the said materids. When the amount of water is less than 50 wt% of the totd solid materids, the kneaded paste is so crumbly that the water-sduble metal sat con not be uniformly dispersed in the ceramic pore. Also, when the amount of water is more than 250 wt% of the total solid materids, a problem can be caused in forming pores in the ceramic catalyst during a drying or firing process.

[33] It is preferable to repeatedly perform the mixing process and the kneading process 80 that the water-sdutle metd sdt can be uniformly impregnated into the pores of the porous ceramic materid in the condition of being dissdved in water.

[34] Step (cx Subsequently, the shaped materid obtained in said process is sufficiently dried at an ordinary room temperature and fired at a temperature of 40 0 ° C to 1,400 °

C, whereby the meta oxide derived from the meta sdt can be uniformly dispersed into the pores of the ceramic materid, to fabricate the porous ceramic catalyst containing a meta oxide of the present invention. When the firing temperature is ower than 400 ° C, the water-sduble metd sdt is not disintegrated, whereby a metd oxide can not be generated in the ceramic layer. When the firing temperature is higher than 1400 ° C, the generated metd oxide or meta may be changed into a liquid state to be extricated. Preferably, the firing time is bnger than one hour.

[35] Step (dx Optiondly, further to said processes, the porous ceramic catalyst containing a meta oxide may be immersed for at least five minutes into meta salt aqueous sdution in which 1 to 20 wt% of water-sdluble metd sdt is dissdved, and then sufficiently dried. Then, the porous ceramic catalyst is secondarily fired at the temperature of 40 0 ° C to 1,400 ° C to prepare a ceramic catalyst coated with a meta oxide. By said coating, the ceramic catalyst has various pores and disintegration properties. When the amount of water-sdutie met sat contained in the metd sat aqueous salution is less than 1 wt%, the amount of a meta oxide generated from the mets sat to be coated on the ceramic materid is very little to deteriorate the coating effect. Also, when the amount of water-sduble metal sat contained in the metal salt aqueous solution is more than 20 wt%, the amount of the generated metd oxide is excessive to greatly ower the uniformity of the metd oxide coating. Most preferably, the contend of the metd sat in the metal st aqueous sdution is approximately 5 to 15 wt%. Preferably, the secondary firing temperature is 40 0 to 1,400 ° C, and the firing time is longer than 30 minutes.

[36] The porous ceramic catalyst according to the present invention has excelent absorption and disintegration properties for vapor phase organic compounds even at a low temperature of ower than 1 00 ° C, such as an ordinary room temperature (approximately 25 ° C), and has an ability to disintegrate water and carbon dioxide at a high temperature of higher than 1 00 ° C. [37 FIG. 1 shows a preparation process of a ceramic catalyst according to one embodiment of the present invention, in which the fdlowing processes are carried out subsequently: Mixing Process (1) of mixing water-salutle meta sdt A, ceramic materid B, and combustible materia C to obtain the mixture thereof having a uniform composition ratio; Shaping Process (2) of adding distilled water D to the mixture in an amount enough to completely dissdve the water-sdutle meta sat and kneading to shape into the desired form; Drying Process (3) of sufficiently drying the shaped catalyst materid at an ordinary room temperature; and Hring Process (4) of firing the shaped catdyst materid at a temperature of 40 0 to 1,400 ° C.

[38] FIG. 2 shows an experiments apparatus for disintegrating vapor phase organic compounds used in the present invention. For an experiment, gas or Vaporous compound is injected into a hermetic seded stainless container 1 through a septum 2 unt the concentrate thereof reach to the desired level. When the compounds to be injected are quid phase, the compounds are injected into an evaporation plate 3 to gradugly vaporize. A catalyst for absorting and disintegrating vapor phase compounds is inputted to a catdyst input (stacked) vessel 4 having a bottom of a 500 mesh stainless wire netting. A fan 5 connected to an externd power source through an electric wire and a concent 6 bows fluid inside the stainless container 1 to the bottom of the catalyst stacked vessel to continuously circulate the fluid inside the stainless container.

[39]

Advantageous Effects

[40]

[41] The ceramic catalyst of the present invention can absorb and disintegrate vapor phase composition even at a bow temperature of bower than 100 ° C, especidly, at an ordinary room temperature of approximately 25 °C, without ight assistance .

[42]

Description of Drawings

[43]

[44] The accompanying drawings, which are induded to provide a further understanding of the invention and are incorporated in and constitute a part of this specification,

Hustrate embodiments of the invention and together with the description serve to exphain the principles of the invention.

[45]

[46] In the drawings: [47 FIG. 1 shows a preparation process of a ceramic catalyst according to one embodiment of the present invention, in which each reference numeral denotes the folows;

[48] A: water-sduble metd sdt,

[49] B: ceramic materid,

[50] C combustible materid,

[51] D: distilled water,

[52] E: catalyst,

[53] 1: mixing process,

[54] 2: shaping process,

[55] 3: drying process, and

[56] 4: firing process. 57 FIG. 2 shows an experimentd apparatus for disintegrating vapor phase organic compounds used in the present invention, in which each reference numerd denotes the fdlows;

[58] 1: hermetic seded reaction container,

[59] 2: septum,

[60] 3: evaporation plate,

[61] 4: catdyst input vessel,

[62] 5: fan, and

[63] 6: electric contrdler.

[64]

Best Mode

[65] Examples

[66] material used

[67]

[68] 90 weight parts of ceramic materia is mixed with 1 weight part of each of ferric chloride, manganese acetate, vanadium sulfate, magnesium acetate, cobet acetate, zinc chbride, cadmium acetate, barium nitrate and tin chbride. Then, 50 weight parts of stearic acid powder with an average partide diameter of 20 /m was added to the mixture to prepare a ceramic catalyst materia mixture. As the ceramic materid, as shown in the flowing table 1, porous dumina, kackn, veinstone, zediite and a fired materia containing 50 wt% of porous dumina and 50 wt% of porous siica were in- dividualy used.

[69] To the mixture, distilled water in the same weight as the mixture was added, and kneaded. then, the kneaded mixture was shaped as the cylindric shape with the diameter of 3 cm and the length of 10 cm, and dried for 72 hours at an ordinary room temperature. The dried material was fired in an electric oven for 10 hours at the temperature of 1000 ° C, and then coded at an ordinary room temperature to fabricate a ceramic catalyst.

[70] The obtained cylindrica ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and then 5 g of the ceramic catalyst was inputted to an ex- perimentd device (Hg. 2) for disintegrating vapor phase organic compounds. After the experiments device was seded, 1000 ppm of propionic ddehyde (C J.CHO) was injected into the experimentd device through the septum, and then maintained for 24 hours at an ordinary room temperature (25 °C to 30 °C) and 60 °C, respectively. The disintegration ratio for propionic adehyde inside the experimental device was measured by using a gas chromatography (HP-5890). The result was shown in the fdlowing table 1.

[71]

[72] [Tabet]

Ce—

Ordinary room 60°C temperature

CT SE

PE SE

= I NE ee 5 pis

Bred materid containing porous dumina and 12 p——

[73]

[74]

[75]

[76] 97 weight parts of ceramic materid in which 20 weight parts of porous dumina, 20 weight parts of kadin, 20 weight parts of zediite, 20 weight parts of veinstone, and 20 weight parts of bentonite were mixed, 2 weight parts of cobelt acetate, and 1 weight parts of water-sdlutle metd sdt as shown in the fdbwing table 2 were mixed with one another. Then, 60 weight parts of fine cod powder with an average diameter of 0.2 1m was added to the mixture to prepare a ceramic catalyst materid mixture. [77 The mixture was mixed with distilled water in the 1.5-times weight of the mixture, and kneaded. Then, the kneaded mixture was shaped as a cylindrica shape having the diameter of 3 cm and the length of 10 cm, and then dried for 72 hours at an ordinary room temperature. The dried materid was fired in an electric furnace for 12 hours at the temperature of 1100 ° C, and then codled at an ordinary room temperature to fabricate a ceramic catalyst.

[78] The obtained cylindrica ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and then 5 g of the ceramic catadyst was inputted to the ex-

perimentd device (Hg. 2) for disintegrating vapor phase organic compounds. After the experimentd device was seded, 1000 ppm of butand (C JOH) was injected to the experimental device through the septum, and then maintained for 24 hours at an ordinary room temperature (25 °C to 30 °C) and 60 °C, respectively. The disin- tegration ratio for butand inside the experiments device was measured by using a gas chromatography (HP-5890). The result was shown in the fdowing table 2.

[79] (80) [Tabi 2) temperature

Cr RS

ET SE J

Co) RE

Vetmeitevso) 5 fe

Ea NE a pm momo) pp

ER NS

Names) opmamaoe) bp awcema) ps comimuweme CaCO) +p

ER TE er RE J

TS SE I

Er RT sotimiyeoseuo pfs posmmeqon ih] prmemion) pfs

ES TR smmmietago) +B imams) ob pre J

[81]

[82] As shown in the above tale 2, a ceramic catalyst of the present invention prepared by mixing a ceramic materia with water-soluble metal sdt and firing the mixture to disperse a metal oxide generated from the meta sat in the ceramic materia has excelent absorting and disintegrating properties for vapor phase organic compounds at a bw temperature of bwer than 100 °C, especidly, at an ordinary room temperature of approximately 25 °C.

[83]

[84]

[85] 86) 97 weight parts of ceramic materi, in which 20 weight parts of porous dumina, 20 weight parts of feldspar, 20 weight parts of zedite, 20 weight parts of veinstone, and weight parts of bentonite were mixed, was mixed with 2 weight parts of cobelt acetate and 1 weight parts of water-sdutie meta sat shown in the fdowing table 3.

Then, 60 weight parts of fine cod powder with the average partide diameter of 0.2 /m was added to the mixture to prepare a ceramic catalyst materia mixture.

[87] The mixture was mixed with distilled water in the 1.5-times weight of the mixture, and then kneaded. Then, the kneaded mixture was shaped as a cylindrica shape having the diameter of 3 cm and the length of 10 cm, and dried for 72 hours at an ordinary room temperature. The dried material was fired in an electric furnace for 12 hours at the temperature of 900 ° C, and then codled at an ordinary room temperature to prepare a ceramic catalyst.

[88] The obtained cylindricd ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and then 5 g of the ceramic catalyst was inputted to the ex- perimental device (Hg. 2) for disintegrating vapor phase organic compounds.

Sufficient amount of water was inputted into the evaporation plate and the ex- perimenta device was sedled to make a humidity inside a container saturated. Then, 2000 ppm of carbon dioxide (CO) was injected to the experiment device through the septum, and maintained for 72 hours with being heated to the temperature of 120 °C.

The amounts of carbon dioxide co, and byproducts inside the experimentd device were measured by using a gas chromatography (HP-5890). The result was shown in the falowing table 3.

[90] [Table 3)

C—— we [r—— rE I

Sm oCHO) 6 beware @0) Pp emmaweso)

Gromewmec®o)

Feogioide®ed) bp

Neelwwoiso) f+ re I oman)

Cmmmmmecaioy)

Tawi) bp bmn pogae@F0) ckombpiosee ChOH) [5

I A ommonon

Cr

Cr I

Cr sodumeituateso) f+ sodumwetaso) Is

Se SI

[91]

[92] As shown in the above table 3, the porous ceramic catdyst containing a meta oxide of the present invention has a disintegration property for carbon dioxide at a high temperature such as higher than 100 °C.

[93] [941 met oxide

[95]

[96] A ceramic catdyst prepared according to the process in Example 1 using porous dumina as a ceramic materid was immersed into 10 wt% metd sdt aqueous sdution for 3 hours, and dried for 24 hours at an ordinary room temperature. The dried meta sdt contained catdyst was fired for 1 hour in an electric oven at a temperature of 1000 °C , and then coded to an ordinary room temperature, to fabricate a ceramic catalyst of the present invention.

[97] The obtained cylindrical ceramic catalyst was ground so that an average diameter thereof could be 1 mm, and 5 g of the ceramic catalyst was inputted to the ex- perimental device (Bg. 2) for disintegrating vapor phase organic compounds. After the experimentd device was seded, 1000 ppm of propionic ddehyde (C J.CHO) was injected to the experiments device through the septum, and maintained for 24 hours at an ordinary room temperature (25 °C to 30°C) and 60 °C respectively. The disin- tegration ratio for the propionic dehyde inside the experimental device was measured by using a gas chromatography (HP-5890). The result was shown in the flowing tate 4.

[98]

[99] [ Tables)

Metd sdt aqueous sdution Disintegration ratio (vdume%)

Ordinary room 60 °C temperature

Camm IR

Som ii

Poin ii TR A

Bi ii I tim yi TR tn li I

Soham ia 30) RN rr SN rr SI J

[100]

[101] As shown in the above table 4, a ceramic catalyst of the present invention, which is additionally coated with a metd sat aqueous sclution, has an excelent disintegration property for vapor phase organic compounds at a ow temperature, such as 60 °C or even at an ordinary room temperature.

[102]

Industrial Applicability

[103]

[104] As aforementioned, the metd oxide contained porous ceramic catdyst having various pores of the present invention, which is obtained by dispersing a water-scluble metd sat into a ceramic materia, or optionaly, by additionally coating the ceramic catalyst with a meta sat aqueous sctution, has an remarkably improved disintegration property for vapor phase organic compounds. Especialy, the porous ceramic catalyst can absorb and disintegrate vapor phase organic compounds even at a bw temperature, such as bwer than 100 °C, or even at an ordinary room temperature. Accordingly, the porous catdyst containing a metd oxide of the present invention has a great industrid applcaility to various fies, such as a removd for odorous materids.

[105] As the present invention may be embodied in severd forms without departing from the spirit or essential characteristics thereof, it should dso be understood that the above-described embodiments are not kmited by any of the details of the foregoing de- scription, unless otherwise specified, but rather should be construed broady within its spirit and scope as defined in the appended daims, and therefore a changes and modi- fications that fal within the metes and bounds of the daims, or equivaence of such metes and bounds are therefore intended to be embraced by the appended daims.

Claims

Claims 1 A porous ceramic catalyst containing a meta oxide having absorting and disintegrating properties for vapor phase chemicals, obtained by mixing 70 to 99.5 wt% of a porous ceramic materid and 0.5 to 30 wt% of water- sduble met sdt with water, shaping, drying and firing, and characterized in containing a metd oxide uniformly dispersed in the ceramic materid.

[2] The porous ceramic catdyst containing a metd oxide of daim 1, wherein a combustitle materid is additionsly mixed with the mixture of the porous ceramic materid and the water-sduble meta sdt, and in the amount of the combustible materid is 70 wt% or less of the weight of the mixture of the porous ceramic materid and the water-sduble meta sat.

[3] The porous ceramic catalyst containing a metd oxide of daim 1, ad- ditionally coated with metd sdt aqueous salution containing 1 to 20 wt% of water-sdutie metal sat and thereby has a various pore distribution and a various disintegration property.

[4] The porous ceramic catdyst containing a metd oxide of daim 2, ad- ditionally coated with meta sdt aqueous salution containing 1 to 20 wt% of water-sdute meta sdt and thereby has a various pore distribution and a various disintegration property.

[5] The porous ceramic catalyst containing a metd oxide of daim 1, wherein the porous ceramic materid is at least one materids selected from the group consisting of porous dumina (Al JO) day, kadiin, flint pebble, pottery stone, feldspar, veinstone, zedite, bentonite, duminum compound, and a fired materid containing at least 10 wt% of porous dumina and at least S50 wt% of silica (SiO >

[6] The porous ceramic catdyst containing a meta oxide of daim 2, wherein the porous ceramic materid is at least one materids selected from the group consisting of porous dumina (Al JO) day, kadiin, flint pebble, pottery stone, feldspar, veinstone, zedite, bentonite, duminum compound, and a fired materia containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO > 4] The porous ceramic catalyst containing a meta oxide of daim 3, wherein the porous ceramic matesid is at least one materids selected from the group consisting of porous dumina (Al JO) day, kadiin, fint pebtle,

pottery stone, feldspar, veinstone, zediite, bentonite, duminum compound, and a fired materid containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO p [81 The porous ceramic catalyst containing a meta oxide of daim 4, wherein the porous ceramic materid is at least one materids selected from the group consisting of porous dumina (Al 0) day, kadlin, flint peble, pottery stone, fekispar, veinstone, zedite, bentonite, duminum compound, and a fired materid containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO p [91 The porous ceramic catalyst containing a metal oxide of daim 1, wherein the water-sdlutle metd sdt is a water-soluble cobelt salt, or a mixture of a water-sdutie cobalt sdt and at least one materids selected from the group consisting of magnesium salt, strontium sat, barium sdt, vanadium salt, chrome sat, manganese salt, ferric sat, nickel salt, copper sdt, zinc sat, cadmium sdt, tin sat, tithmuth sat, sodium st, cacium hydroxide, Kthium hydroxide, potassium hydroxide and barium hydroxide.

[10] The porous ceramic catdyst containing a metal oxide of daim 2, wherein the water-sdlubie met sdt is a water-soluble cobelt sat, or a mixture of a water-sdutie cobelt st and at least one materids selected from the group consisting of magnesium salt, strontium salt, barium sat, vanadium st, chrome sdlt, manganese sdt, ferric sdt, nickel sdt, copper sdt, zinc sdt, cadmium sdt, tin sdt, lithmuth sat, sodium sdt, cacium hydroxide, Ethium hydroxide, potassium hydroxide and barium hydroxide.

[11] The porous ceramic catalyst containing a mets oxide of daim 3, wherein the water-sclule mets sdt is a water-sdlutie cobet st, or a mixture of a water-sdubie cobalt sat and at least one materids selected from the group consisting of magnesium salt, strontium sat, barium sdt, vanadium sdt, chrome sdt, manganese sd, ferric sdlt, nickel sat, copper sat, zinc sdt, cadmium sdt, tin sat, tithmuth sdt, sodium sdt, calcium hydroxide, lithium hydroxide, potassium hydroxide and barium hydroxide. [12) The porous ceramic catalyst containing a metd oxide of daim 4, wherein the water-salutle metd sdt is a water-salutie cobelt sdt, or a mixture of a water-sdutle cobet sat and at least one materids selected from the group consisting of magnesium salt, strontium sat, barium sat, vanadium sd, chrome sdt, manganese sdlt, ferric sdt, nickel sat, copper sat, zinc sdt,

cadmium salt, tin sdt, tithmuth sat, sodium sat, cdcium hydroxide, Kthium hydroxide, potassium hydroxide and barium hydroxide.

[13] The porous ceramic catalyst containing a metd oxide of daim 2, wherein the combustitie material is a powder type hydrocarbon compound composed of carbon, hydrogen, and oxygen, induding adipic acid, melanin, sugar, stearic acid, and paraffin; a powder type carbon compound selected from the group consisting of carbon Hack, fine cod and graphite powder; or a mixture thereof.

[14] The porous ceramic catalyst containing a meta oxide of daim 4, wherein the combustible materid is a powder type hydrocarbon compound composed of carbon, hydrogen, and oxygen, induding adipic acid, melanin, sugar, stearic acid, and paraffin; a powder type carbon compound selected from the group consisting of carbon tack, fine cod and graphite powder; or a mixture thereof.

[15] A method for preparing a porous ceramic catalyst containing a metal oxide comprising the steps of: (a) mixing 70 to 99.5 wt% of porous ceramic materid with 0.5 to 30 wt% of water-sdlutle metal sat (b) kneading the mixture of the porous ceramic materi and the water- scluble meta sdt with water and then shaping the kneading materid in a desired form; and (c) drying the shaped material at an ordinary room temperature, firing at a temperature of 400 °C to 1,400 °C, to uniformly disperse a meta oxide generated from the metal sat in the ceramic material.

[16] The method of daim 15, wherein a combustile materid is added to the mixture of the porous ceramic materia and the water-sclutie metal sdt, in the amount of 70 wt% or less based on the weight of the mixture to the mixture of the porous ceramic materia and the water-slutie meta sdt. 17 The method of daim 15, folowing to steps (a) to (c), further comprising the step (d) of immersing the obtained porous ceramic catalyst containing a metd oxide into metal sat aqueous sdution containing 1 to 20 wt% of water-sdlutie metal sat for at least five minutes, sufficiently drying and then secondarily firing at a temperature of 400 °C to 1,400 °C, to coat the porous ceramic catalyst containing a meta oxide with a metd oxide.

[18] The method of daim 16, flowing to steps (a) to (c), further comprising the step (d) of immersing the obtained porous ceramic catalyst containing a metal oxide into metd sdt aqueous sdution containing 1 to 20 wt% of water-sdutie metd sat for at least five minutes, sufficiently drying and then secondarily firing at a temperature of 400 °C to 1,400 °C, to coat the porous ceramic catalyst containing a metd oxide with a metd oxide.

[19] The method of daim 15, wherein the porous ceramic materia is at least one materids selected from the group consisting of porous dumina (Al 0, ), day, kadiin, fint pebble, pottery stone, feldspar, veinstone, zedite, bentonite, duminum compound, and a fired materid containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO D2

[20] The method of daim 16, wherein the porous ceramic materid is at least one materids selected from the group consisting of porous alumina (Al 0, ), day, kadin, fint pebble, pottery stone, feldspar, veinstone, zedite, bentonite, duminum compound, and a fired materia containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO pl

[21] The method of daim 17, wherein the porous ceramic materid is at least one materids selected from the group consisting of porous dumina (Al 0, ), day, kadiin, flint pebble, pottery stone, feldspar, veinstone, zedite, bentonite, duminum compound, and a fired materid containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO pz

[22] The method of daim 18, wherein the porous ceramic materid is at least one materids selected from the group consisting of porous dumina (Al 0, ), day, kadiin, flint pebble, pottery stone, feldspar, veinstone, zedite, bentonite, duminum compound, and a fired materid containing at least 10 wt% of porous dumina and at least 50 wt% of silica (SiO )-

[23] The method of daim 15, wherein the water-sdutie meta sdt is a water- scluble cobdt sdt, or a mixture of a water-solutie cobelt sdt and at least one materids selected from the group consisting of magnesium salt, strontium salt, barium sat, vanadium sdt, chrome salt, manganese sat, ferric sdt, nickel sat, copper sdt, zinc sdt, cadmium salt, tin sdt, bithmuth sdlt, sodium sdt, cdcium hydroxide, kthium hydroxide, potassium hydroxide and barium hydroxide.

[24] The method of daim 16, wherein the water-solutie metal sat is a water- sdluble cobdt sat, or a mixture of a water-sdlutle cobdt sat and at least one materids selected from the group consisting of magnesium salt,

strontium salt, barium sdt, vanadium sat, chrome sdt, manganese sdit, ferric sdt, nickel sdt, copper salt, zinc sdt, cadmium sdt, tin sat, tithmuth sdt, sodium sat, cdcium hydroxide, lithium hydroxide, potassium hydroxide and barium hydroxide.

[25] The method of daim 17, wherein the water-sdutle meta sdt is a water- sdutie cobalt sat, or a mixture of a water-saluble cobelt sat and at least one materids selected from the group consisting of magnesium sdt, strontium sat, barium sat, vanadium sat, chrome sgt, manganese sdt, ferric salt, nickel sdt, copper sdt, zinc sat, cadmium sdt, tin sdt, tithmuth sdt, sodium sdt, cdcium hydroxide, Kthium hydroxide, potassium hydroxide and barium hydroxide.

[26] The method of daim 18, wherein the water-sdutie meta sdt is a water- salute cobet sdt, or a mixture of a water-sduble cobet sat and at least one materids selected from the group consisting of magnesium st, strontium set, barium sat, vanadium sst, chrome sat, manganese sat, ferric sat, nickel sdt, copper sdt, zinc salt, cadmium sdt, tin salt, bithmuth salt, sodium sdt, cécium hydroxide, lithium hydroxide, potassium hydroxide and barium hydroxide. 27] The method of daim 16, wherein the combustible materi is a powder type hydrocarbon compound composed of carbon, hydrogen, and oxygen, induding adipic acid, melanin, sugar, stearic acid, and paraffin; a powder type carbon compound selected from the group consisting of carbon black, fine cod and graphite powder; or a mixture thereof.

[28] The method of daim 18, wherein the combustible materid is a powder type hydrocarbon compound composed of carbon, hydrogen, and oxygen, induding adipic acid, melanin, sugar, stearic acid, and paraffin; a powder type carbon compound selected from the group consisting of carbon Hack, fine cod and graphite powder; or a mixture thereof.