KR20020051049A - Adsorbent for removal of carbon monoxide and method for preparing thereof - Google Patents

Adsorbent for removal of carbon monoxide and method for preparing thereof Download PDF

Info

Publication number
KR20020051049A
KR20020051049A KR1020000080388A KR20000080388A KR20020051049A KR 20020051049 A KR20020051049 A KR 20020051049A KR 1020000080388 A KR1020000080388 A KR 1020000080388A KR 20000080388 A KR20000080388 A KR 20000080388A KR 20020051049 A KR20020051049 A KR 20020051049A
Authority
KR
South Korea
Prior art keywords
gas
adsorbent
natural zeolite
zeolite
acid
Prior art date
Application number
KR1020000080388A
Other languages
Korean (ko)
Inventor
고동준
Original Assignee
신현준
재단법인 포항산업과학연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 신현준, 재단법인 포항산업과학연구원 filed Critical 신현준
Priority to KR1020000080388A priority Critical patent/KR20020051049A/en
Publication of KR20020051049A publication Critical patent/KR20020051049A/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16—Alumino-silicates
    • B01J20/18—Synthetic zeolitic molecular sieves
    • B01J20/186—Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/3085—Chemical treatments not covered by groups B01J20/3007 - B01J20/3078
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B01D2253/1085—Zeolites characterized by a silicon-aluminium ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/502—Carbon monoxide

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Inorganic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

PURPOSE: An acid treatment method of zeolite adsorbent for the removal of carbon monoxide gas is provided to improve adsorption capacity by treating natural zeolite with HCl. CONSTITUTION: The method comprises the steps of dipping natural zeolite in HCl solution; agitation of the mixture at 80°C for 4 hours followed by rinsing with distilled water; drying it at 110°C and then calcining at 500°C. According to above test, the higher HCl concentration is, the larger specific surface area of zeolite is. Also, the weight ratio of Si/Al was increased up to 8.4.

Description

일산화탄소 가스의 제거용 흡착제 및 제거방법{ADSORBENT FOR REMOVAL OF CARBON MONOXIDE AND METHOD FOR PREPARING THEREOF}Adsorbent and removal method for removing carbon monoxide gas {ADSORBENT FOR REMOVAL OF CARBON MONOXIDE AND METHOD FOR PREPARING THEREOF}

[산업상 이용 분야][Industrial use]

본 발명은 가스 중에 함유된 CO 가스의 제거용 흡착제 및 제거방법에 관한 것으로, 특히 산처리된 천연 제올라이트를 이용하여 CO 가스를 효과적으로 흡착하여 제거하는 제거방법에 관한 것이다.The present invention relates to an adsorbent for removing CO gas contained in a gas and a method for removing the same, and more particularly, to a method of removing and adsorbing CO gas effectively using an acid treated natural zeolite.

[종래 기술][Prior art]

일반적으로 가스 중에 함유된 CO 가스를 제거하는 방법으로는 촉매산화법이 많이 이용되고 있다. 촉매산화법에 사용되는 촉매로는 주로 Pt/Al2O3(공지문헌 "Catal.Lett.,vol.4,43,1990"), Pt/SnO2(공지문헌 "J.Catal.,col.122,193,1990"), Au/Fe2O3-Al2O3(공지문헌 "Catal.Sci.Tech.,vol.144,175,1993") 등이 제안되어 있다. 그러나, 촉매를 이용하는 방법은 사용되는 촉매가 고가이고, 촉매의 활성을 유지하기 위해서 일정 온도 이상으로 가열시켜 주어야 하기 때문에 경제적이지 못하다는 단점 있다.In general, catalytic oxidation is widely used as a method of removing CO gas contained in gas. Catalysts used in the catalytic oxidation method are mainly Pt / Al 2 O 3 (known document "Catal. Lett., Vol. 4,43,1990"), Pt / SnO 2 (known document "J. Catal., Col. 122, 193) , 1990 "), Au / Fe 2 O 3 -Al 2 O 3 (known document" Catal. Sci. Tech., Vol. 144,175,1993 ") and the like have been proposed. However, the method using the catalyst is disadvantageous because the catalyst used is expensive and it is not economical because it must be heated above a certain temperature in order to maintain the activity of the catalyst.

한편, 합성 제올라이트의 경우 CO를 흡착하는 능력이 있는 것으로 알려져 있으나(공지문헌 "D.W.Breck, 'Zeolite Molecular Sieves', by John Wiley & Sons,Inc.,pp593∼724, 1974), 흡착량이 작기 때문에 상업적으로 응용되지 못하고 있는 실정이다.Synthetic zeolites, on the other hand, are known to have the ability to adsorb CO (known literature "DWBreck, 'Zeolite Molecular Sieves', by John Wiley & Sons, Inc., pp 593-724, 1974). The situation is not applied to.

본 발명은 상기 종래 기술의 문제점을 고려하여, 가스 중에 함유된 CO 가스를 제거하기 위한 흡착제를 제공하는 것을 목적으로 한다.In view of the problems of the prior art, an object of the present invention is to provide an adsorbent for removing CO gas contained in gas.

본 발명의 다른 목적은 상기 흡착제를 사용하여 가스 중에 함유된 CO 가스의 제거방법을 제공하는 것이다.Another object of the present invention is to provide a method for removing CO gas contained in a gas using the adsorbent.

[과제를 해결하기 위한 수단][Means for solving the problem]

본 발명은 상기 목적을 달성하기 위하여, 천연 제올라이트를 산처리하여 제조한 흡착제를 제공한다.The present invention provides an adsorbent prepared by acid treatment of natural zeolite in order to achieve the above object.

또한 본 발명은 가스 중에 함유된 CO 가스의 제거방법에 있어서,In addition, the present invention is a method for removing CO gas contained in the gas,

a) 천연 제올라이트를 산처리하여 흡착제를 제공하는 단계; 및a) acid treating the natural zeolite to provide an adsorbent; And

b) 상기 흡착제에 CO 가스가 함유된 가스를 접촉시키는 단계b) contacting the adsorbent with a gas containing CO gas

를 포함하는 CO 가스의 제거방법을 제공한다.It provides a method for removing CO gas comprising a.

이하 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

[작용][Action]

본 발명은 천연 제올라이트를 산처리하여 제조한 흡착제에 CO 가스를 함유한가스를 접촉시킴으로써 CO 가스를 흡착하여 제거하는데 효율적이다.The present invention is effective in adsorbing and removing CO gas by bringing a gas containing CO gas into contact with an adsorbent prepared by acid treatment of natural zeolite.

본 발명에 적용되는 천연 제올라이트는 원석으로 채취되는 것으로 대한민국 포항 인근의 동해안 지역의 광산에서 생산되고 있다. 이러한 원석은 X-선 회절분석에 의하면 클리놉티오라이트(clipnotiloite), 모더나이트(mordenite), 및 휼란다이트(heulandite) 등이 혼재하는 결정성의 화합물로, 이는 실리카 및 알루미나를 주성분으로 하고 Fe나 알카리 성분 등의 불순물이 함유되어 있다.Natural zeolites to be applied to the present invention are harvested as gemstones and are produced in mines on the east coast near Pohang, South Korea. These gemstones are crystalline compounds in which clinopthioite, mordenite, and heulandite are mixed according to X-ray diffraction analysis, which are mainly composed of silica and alumina, Impurities, such as an alkaline component, are contained.

본 발명은 이러한 천연 제올라이트를 산처리하여 표면적을 넓히고 이를 CO 가스의 흡착에 이용하는데 그 특징이 있다.The present invention is characterized by broadening the surface area by acid treatment of such natural zeolite and using it for adsorption of CO gas.

본 발명에 적용되는 천연 제올라이트의 산처리는 염산, 또는 질산 용액에 천연 제올라이트를 침전하여 교반한 후 물로 세척하고 건조함으로써 실시된다. 이러한 산 처리를 통하여 천연 제올라이트에 포함되어 있는 Fe나 알카리 성분의 불순물과 알루미나가 빠져나오면서, 표면적이 넓어질 뿐만 아니라 적절한 세공크기를 갖는 세공구조가 이루어져 CO 가스에 대한 흡착능이 우수한 흡착제가 제조된다.Acid treatment of the natural zeolite applied to the present invention is carried out by precipitating and stirring the natural zeolite in hydrochloric acid or nitric acid solution, followed by washing with water and drying. Through such acid treatment, the impurities and alumina of Fe or alkali components contained in the natural zeolite are released, and the surface area is widened, and a pore structure having an appropriate pore size is formed to prepare an adsorbent having excellent adsorption capacity to CO gas.

산처리하는 정도는 천연 제올라이트의 주성분인 실리카와 알루미나가 Si/Al 중량비로 5 이상이 되도록 산처리하는 것이 바람직하다. 광석 상태의 천연 제올라이트는 Si/Al 중량비가 3.5∼4.0 정도이나, 산처리에 따라 알루미나 성분이 제거되면서 Si/Al 중량비가 증가하게 된다. Si/Al 중량비가 5 미만인 경우에는 천연 제올라이트의 표면적 증가 정도가 낮기 때문에 CO 가스에 대한 흡착력이 저하된다.The degree of acid treatment is preferably acid treated such that silica and alumina, which are main components of natural zeolite, are 5 or more in a Si / Al weight ratio. The natural zeolite in the ore state has a Si / Al weight ratio of about 3.5 to 4.0, but the Si / Al weight ratio increases as the alumina component is removed by acid treatment. When the Si / Al weight ratio is less than 5, since the extent of increase of the surface area of the natural zeolite is low, the adsorption force to CO gas is lowered.

상기 산처리 정도는 사용하는 산 용액의 농도와 산처리 시간에 따라 조절할 수 있다. 즉, 고농도의 산 용액을 사용할 때는 짧은 시간 내에 산처리를 완료할수 있으며, 저농도의 산용액을 사용할 때는 장시간 동안 산처리를 해야 충분한 Si/Al 중량비를 맞출 수 있다.The acid treatment degree can be adjusted according to the concentration of the acid solution to be used and the acid treatment time. That is, the acid treatment can be completed within a short time when using a high concentration of acid solution, and when using a low concentration of acid solution, acid treatment for a long time to meet a sufficient Si / Al weight ratio.

이하의 실시예 및 비교예를 통하여 본 발명을 더욱 상세하게 설명한다. 단 실시예는 본 발명을 예시하기 위한 것이지 이들만으로 한정하는 것은 아니다.The present invention will be described in more detail with reference to the following examples and comparative examples. However, the examples are not intended to limit the present invention to illustrate the invention.

[실시예]EXAMPLE

실시예 1Example 1

천연 제올라이트 200 g을 0.1, 0.5, 및 1 N 농도의 800 mL HCl 용액에 각각 넣고, 이를 80 ℃에서 4 시간 동안 교반하여 불순물을 제거하였다. 이를 물로 세척한 후 110 ℃에서 건조하였고, 이와 같이 건조된 시료는 500 ℃의 공기 중에서 소성하였다. 상기와 같은 방법으로 제조한 산처리된 천연 제올라이트의 표면적과 Si/Al 중량비를 측정하여 하기의 표 1에 나타내었다.200 g of natural zeolite were put in 800 mL HCl solution of 0.1, 0.5, and 1 N concentrations, respectively, and stirred at 80 ° C. for 4 hours to remove impurities. It was washed with water and dried at 110 ° C., and the dried sample was calcined in air at 500 ° C. The surface area and Si / Al weight ratio of the acid-treated natural zeolite prepared by the above method were measured and shown in Table 1 below.

[표 1]TABLE 1

산처리조건Acid treatment condition 천연제올라이트Natural zeolite 0.1 N HCl0.1 N HCl 0.5 N HCl0.5 N HCl 1 N HCl1 N HCl 표면적 (㎡/g)Surface area (㎡ / g) 5454 8383 128128 152152 Si/Al 중량비Si / Al weight ratio 3.73.7 5.25.2 7.37.3 8.48.4

상기 표 1에 나타낸 바와 같이, HCl의 농도가 증가할수록 천연 제올라이트의 표면적이 증가하고, Si/Al 중량비도 증가하는 것을 확인할 수 있었다.As shown in Table 1, it was confirmed that as the concentration of HCl increases, the surface area of the natural zeolite increases, and the Si / Al weight ratio also increases.

실시예 2Example 2

상기 실시예 1에서 제조한 천연 제올라이트, 및 0.1, 0.5, 1 N HCl로 산처리된 천연 제올라이트의 CO 가스 흡착성능을 측정하기 위하여, 공기 중에 500 ppm의CO 가스가 함유된 혼합가스를 사용하여 CO 가스의 흡착량을 측정하였다.In order to measure the CO gas adsorption performance of the natural zeolite prepared in Example 1 and the natural zeolite acid-treated with 0.1, 0.5, 1 N HCl, CO was mixed using 500 ppm of CO gas in air. The adsorption amount of gas was measured.

CO 가스의 흡착량 측정실험은 상온에서 혼합가스를 흡착제가 들어있는 컬럼에 통과시키면서 흡착되어 나오는 가스를 분석하여 측정하였다.Adsorption amount measurement experiment of CO gas was measured by analyzing the gas adsorbed while passing the mixed gas through the column containing the adsorbent at room temperature.

비교예 1Comparative Example 1

CO 가스에 대한 흡착능이 있다고 알려진 합성 제올라이트인 MS 13X를 사용하여 실시예 2와 동일한 방법으로 CO 가스의 흡착량을 측정하였다.The adsorption amount of CO gas was measured in the same manner as in Example 2 using MS 13X, which is a synthetic zeolite known to have an adsorption capacity for CO gas.

상기 실시예 2, 및 비교예 1의 실험 결과를 비교하여 하기의 표 2에 각각 나타내었다.The experimental results of Example 2 and Comparative Example 1 were compared and shown in Table 2 below.

[표 2]TABLE 2

흡착제absorbent 천연 제올라이트Natural zeolite 합성 제올라이트MS 13XSynthetic Zeolite MS 13X Si/Al = 3.7Si / Al = 3.7 Si/Al = 5.2Si / Al = 5.2 Si/Al = 7.3Si / Al = 7.3 Si/Al = 8.4Si / Al = 8.4 흡착량(g/g 흡착제)Adsorption amount (g / g adsorbent) 0.160.16 0.260.26 0.330.33 0.340.34 0.180.18

상기 표 2에 나타낸 바와 같이, 실시예 2의 경우 천연 제올라이트에 처리한 HCl의 농도가 증가할수록 CO 가스의 흡착량이 크게 증가하는 것을 알 수 있었으며, 비교예 1의 합성 제올라이트보다 산처리된 천연 제올라이트의 CO 가스 흡착량이 높음을 확인 할 수 있었다.As shown in Table 2, in the case of Example 2, as the concentration of HCl treated in the natural zeolite was increased, the adsorption amount of CO gas was significantly increased, and the acid-treated natural zeolite of Comparative Example 1 CO gas adsorption was high.

상기에서 살펴본 바와 같이, 본 발명은 산처리된 천연 제올라이트를 이용하여 가스 중에 함유된 CO 가스를 효과적으로 흡착하여 제거할 수 있다.As described above, the present invention can effectively remove and remove the CO gas contained in the gas by using the acid-treated natural zeolite.

Claims (4)

산처리된 천연 제올라이트를 포함하는 CO 가스 제거용 흡착제.Adsorbent for CO gas removal comprising acid treated natural zeolite. 제 1 항에 있어서, 상기 산처리된 천연 제올라이트는 천연 제올라이트를 산 용액에 담궈 교반한 후, 세척하고 건조하여 제조한 것인 CO 가스 제거용 흡착제.The adsorbent for removing CO gas according to claim 1, wherein the acid-treated natural zeolite is prepared by dipping and stirring the natural zeolite in an acid solution, followed by washing and drying. 제 1 항에 있어서, 상기 산처리된 천연 제올라이트는 Si/Al 중량비가 5 이상인 CO 가스 제거용 흡착제.The adsorbent for removing CO gas according to claim 1, wherein the acid treated natural zeolite has a Si / Al weight ratio of 5 or more. 가스 중에 함유된 CO 가스의 제거방법에 있어서,In the method of removing the CO gas contained in the gas, a) 산처리된 천연 제올라이트를 포함하는 흡착제를 제공하는 단계; 및a) providing an adsorbent comprising an acid treated natural zeolite; And b) 상기 흡착제에 CO 가스가 함유된 가스를 접촉시키는 단계b) contacting the adsorbent with a gas containing CO gas 를 포함하는 CO 가스의 제거방법.CO gas removal method comprising a.
KR1020000080388A 2000-12-22 2000-12-22 Adsorbent for removal of carbon monoxide and method for preparing thereof KR20020051049A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020000080388A KR20020051049A (en) 2000-12-22 2000-12-22 Adsorbent for removal of carbon monoxide and method for preparing thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020000080388A KR20020051049A (en) 2000-12-22 2000-12-22 Adsorbent for removal of carbon monoxide and method for preparing thereof

Publications (1)

Publication Number Publication Date
KR20020051049A true KR20020051049A (en) 2002-06-28

Family

ID=27684711

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020000080388A KR20020051049A (en) 2000-12-22 2000-12-22 Adsorbent for removal of carbon monoxide and method for preparing thereof

Country Status (1)

Country Link
KR (1) KR20020051049A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100787118B1 (en) * 2007-02-20 2007-12-21 요업기술원 A zeolite adsorbent to remove harmfull gases released from elestomer, and a method of prepairing the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60139337A (en) * 1983-12-27 1985-07-24 Toyo Soda Mfg Co Ltd Carbon monoxide adsorbent
JPS6118431A (en) * 1984-07-04 1986-01-27 Nippon Kokan Kk <Nkk> Adsorbent of carbon monoxide
JPS6135850A (en) * 1984-07-30 1986-02-20 Toyo Soda Mfg Co Ltd Carbon monoxide adsorbent
JPS61181981A (en) * 1985-02-06 1986-08-14 Nec Corp Automatic tracking controller
KR900001537A (en) * 1988-07-20 1990-02-27 우치야마 히사오 Automotive air conditioning system
KR930005302A (en) * 1991-08-14 1993-03-23 김광호 Laser diode and manufacturing method thereof
KR0146889B1 (en) * 1994-12-09 1998-08-17 김만제 Preparing process of co absorbent using natural zeolite

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60139337A (en) * 1983-12-27 1985-07-24 Toyo Soda Mfg Co Ltd Carbon monoxide adsorbent
JPS6118431A (en) * 1984-07-04 1986-01-27 Nippon Kokan Kk <Nkk> Adsorbent of carbon monoxide
JPS6135850A (en) * 1984-07-30 1986-02-20 Toyo Soda Mfg Co Ltd Carbon monoxide adsorbent
JPS61181981A (en) * 1985-02-06 1986-08-14 Nec Corp Automatic tracking controller
KR900001537A (en) * 1988-07-20 1990-02-27 우치야마 히사오 Automotive air conditioning system
KR930005302A (en) * 1991-08-14 1993-03-23 김광호 Laser diode and manufacturing method thereof
KR0146889B1 (en) * 1994-12-09 1998-08-17 김만제 Preparing process of co absorbent using natural zeolite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100787118B1 (en) * 2007-02-20 2007-12-21 요업기술원 A zeolite adsorbent to remove harmfull gases released from elestomer, and a method of prepairing the same

Similar Documents

Publication Publication Date Title
US4019879A (en) Selective adsorption of carbon monoxide from gas streams
KR100557835B1 (en) An adsorbent for a hydrocarbon stream and process
EP1121977A2 (en) Adsorbent for removing sulfur compound from fuel gases and removal method
US7608134B1 (en) Decarbonating gas streams using zeolite adsorbents
US3909455A (en) Catalyst and process for making same
CA2023004C (en) Removal of trialkyl arsines from fluids
US4933159A (en) Sorption of trialkyl arsines
AU625031B1 (en) Process for removing trialkyl arsines from fluids
JP3742284B2 (en) Adsorbent for sulfur compounds in fuel gas and method for removing the same
CN112337481B (en) Application of catalyst capable of removing hydrogen cyanide and ammonia gas simultaneously in treatment of tail gas containing hydrogen cyanide and ammonia gas
US3789581A (en) Process for initial removal of sulfur compounds from gaseous hydrocarbon feedstocks before removal of arsenic therefrom
US6589493B2 (en) Gas purification-treating agents and gas purifying apparatuses
JP4026700B2 (en) Adsorbent for removing sulfur compounds in fuel gas
JP3550653B2 (en) Method for treating nitrous oxide gas-containing gas and catalyst for treating the same
KR20020051049A (en) Adsorbent for removal of carbon monoxide and method for preparing thereof
CA2933058C (en) Improved adsorption of acid gases
CA2605282C (en) Process for the removal of heavy metals from gases, and compositions therefor and therewith
RU2705065C1 (en) Method of natural gas adsorption drying and purification
KR100562883B1 (en) Low temperature oxidation catalyst for removal of toxic gases and preparation method thereof
KR100715467B1 (en) Adsorbent of ethylene and its preparing method
KR100503227B1 (en) Oxidation catalyst for remonal of chlorinated volatile organic compounds and method for preparing thereof
SU827132A1 (en) Method of cleaning oxygen-containing gases
JPS5922655A (en) Gaseous ammonia removing agent
SU1641418A1 (en) Catalyst for cleaning air of carbon monoxide and method for its manufacture
RU2060817C1 (en) Process for modifying natural shungite sorbent

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E601 Decision to refuse application