JP2001170497A - Catalyst for cleaning air - Google Patents
Catalyst for cleaning airInfo
- Publication number
- JP2001170497A JP2001170497A JP35447199A JP35447199A JP2001170497A JP 2001170497 A JP2001170497 A JP 2001170497A JP 35447199 A JP35447199 A JP 35447199A JP 35447199 A JP35447199 A JP 35447199A JP 2001170497 A JP2001170497 A JP 2001170497A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- adsorbent
- photocatalyst
- titanium oxide
- air purification
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 46
- 238000004140 cleaning Methods 0.000 title abstract 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000011941 photocatalyst Substances 0.000 claims abstract description 46
- 239000011230 binding agent Substances 0.000 claims abstract description 40
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000003463 adsorbent Substances 0.000 claims description 60
- 238000004887 air purification Methods 0.000 claims description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 28
- 239000000758 substrate Substances 0.000 description 21
- 230000001699 photocatalysis Effects 0.000 description 11
- 229910021536 Zeolite Inorganic materials 0.000 description 5
- 239000002781 deodorant agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000010457 zeolite Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000001877 deodorizing effect Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 150000003609 titanium compounds Chemical group 0.000 description 3
- 150000004703 alkoxides Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- -1 titanium alkoxide Chemical class 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 101100422634 Postia placenta (strain ATCC 44394 / Madison 698-R) STS-02 gene Proteins 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気中に存在する
悪臭物質等の有害物質を浄化するための空気浄化触媒に
関する。The present invention relates to an air purification catalyst for purifying harmful substances such as malodorous substances present in the air.
【０００２】[0002]
【従来の技術】従来の空気中に存在する悪臭物質等の有
害物質を浄化するための空気浄化触媒は、基材表面上に
形成された光触媒と吸着剤とから構成することが一般的
である。ここで光触媒は、一般的に酸化チタン、吸着剤
には、ゼオライト、活性炭等が用いられている。2. Description of the Related Art A conventional air purification catalyst for purifying harmful substances such as malodorous substances existing in the air generally comprises a photocatalyst formed on the surface of a substrate and an adsorbent. . Here, titanium oxide is generally used as the photocatalyst, and zeolite, activated carbon and the like are used as the adsorbent.
【０００３】しかしながら、空気浄化触媒として光触媒
と吸着剤とを混合して、そのまま用いると吸着剤は光触
媒に照射される光量が減衰する立体障害となり、光触媒
表面の活性中心の生成が抑えられて、光触媒の光触媒能
が低下する。However, if a photocatalyst and an adsorbent are mixed and used as an air purification catalyst and used as they are, the adsorbent becomes a steric hindrance in which the amount of light irradiated on the photocatalyst is attenuated, and the generation of active centers on the photocatalyst surface is suppressed. The photocatalytic ability of the photocatalyst decreases.
【０００４】この光触媒能の低下を防止する目的で、特
開平１０−９４５８７は、基材表面上に光触媒と吸着剤
と膜強化剤であるフィラーとをもつ吸着剤層と、その吸
着剤層の表面に光触媒とシリカ系バインダとをもつ光触
媒層とからなる空気浄化触媒を開示している。In order to prevent the photocatalytic activity from decreasing, Japanese Patent Application Laid-Open No. Hei 10-94587 discloses an adsorbent layer having a photocatalyst, an adsorbent and a filler as a film reinforcing agent on the surface of a substrate, and an adsorbent layer comprising the adsorbent layer. An air purification catalyst comprising a photocatalyst and a photocatalyst layer having a silica-based binder on the surface is disclosed.
【０００５】すなわち、吸着剤を混合しない上触媒層を
空気浄化触媒の最表面に形成することにより吸着剤によ
る立体障害を防止することができる。なお、ここでフィ
ラーは、触媒層に強度を付与する目的で添加する物質で
ある。That is, by forming an upper catalyst layer on which the adsorbent is not mixed on the outermost surface of the air purification catalyst, steric hindrance due to the adsorbent can be prevented. Here, the filler is a substance added for the purpose of imparting strength to the catalyst layer.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、従来の空気
浄化触媒と比較したときに、より機能が高い空気浄化触
媒を提供することを解決すべき課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide an air purifying catalyst having a higher function than a conventional air purifying catalyst.
【０００７】[0007]
【課題を解決するための手段】本発明者らは、上記課題
を解決する目的で鋭意研究を行った結果、空気浄化触媒
の最表面に形成された光触媒層に、従来のシリカ系バイ
ンダに代えてチタニア系バインダを用いることにより空
気浄化触媒の機能が向上するという発見に基づいて以下
の発明をした。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, the photocatalytic layer formed on the outermost surface of the air purification catalyst has been replaced with a conventional silica-based binder. Based on the discovery that the function of an air purification catalyst is improved by using a titania-based binder, the following invention was made.
【０００８】すなわち、上記課題を解決する空気浄化触
媒は、基材と、該基材表面に担持された吸着剤層と、該
吸着剤層上に担持された酸化チタン粒子と該酸化チタン
を結合するチタニア系バインダとを含む光触媒層とを有
することを特徴とする。[0008] That is, an air purification catalyst which solves the above-mentioned problem comprises a substrate, an adsorbent layer carried on the surface of the substrate, and titanium oxide particles carried on the adsorbent layer and the titanium oxide bonded. And a photocatalytic layer containing a titania-based binder.
【０００９】この理由としては、チタニア系バインダが
従来の空気浄化触媒の光触媒層に用いられているシリカ
系バインダと異なり光触媒作用を有しているためと考え
られる。The reason is considered to be that the titania-based binder has a photocatalytic action unlike the silica-based binder used in the photocatalytic layer of the conventional air purification catalyst.
【００１０】すなわち、バインダには、酸化チタン表面
を被覆して被浄化成分である有害物質が酸化チタンの活
性中心が存在する表面に吸着することを妨げる作用があ
ると考えられる。そして、さらにバインダには、前述し
た吸着剤と同様にその立体障害によって光の透過を妨げ
ることにより、酸化チタンの光触媒能を低下させる作用
が考えられる。このように従来の空気浄化触媒は、バイ
ンダによって酸化チタンの光触媒としての能力が十分発
揮できなかったのに対して、本発明の空気浄化触媒は、
チタニア系バインダの光触媒作用によって光触媒層は、
光触媒としての能力低下を最小限に抑えられるものと考
えられる。[0010] That is, it is considered that the binder has an effect of coating the surface of the titanium oxide to prevent harmful substances, which are components to be purified, from adsorbing on the surface where the active centers of the titanium oxide exist. Further, the binder is considered to have an effect of reducing the photocatalytic ability of titanium oxide by preventing light transmission by steric hindrance similarly to the above-mentioned adsorbent. As described above, the conventional air purification catalyst was not able to sufficiently exhibit the ability of titanium oxide as a photocatalyst due to the binder, whereas the air purification catalyst of the present invention is:
Due to the photocatalytic action of the titania-based binder, the photocatalytic layer
It is considered that the reduction in the performance as a photocatalyst can be minimized.
【００１１】また、吸着剤層の存在により、空気中の有
害物質を吸着除去することができるので光触媒層のみで
は、空気浄化能が充分でない場合に空気中の有害物質を
一時的に吸着除去することが可能である。In addition, since the presence of the adsorbent layer allows the harmful substances in the air to be adsorbed and removed, the photocatalyst layer alone temporarily absorbs and removes the harmful substances in the air when the air purification ability is not sufficient. It is possible.
【００１２】したがって、本発明の空気浄化触媒は、従
来の空気浄化触媒と比較して、より触媒の機能が高いと
いう効果がある。Therefore, the air purification catalyst of the present invention has an effect that the function of the catalyst is higher than that of the conventional air purification catalyst.
【００１３】[0013]
【発明の実施の形態】以下に本発明の空気浄化触媒の実
施形態について、詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the air purification catalyst of the present invention will be described in detail.
【００１４】本実施形態の空気浄化触媒は、基材と、そ
の基材表面に担持された吸着剤層と、その吸着剤層上に
担持された光触媒層とを有する。そして、空気浄化触媒
は、基材と基材上に担持された吸着剤層および光触媒層
以外に何らかの構成を加えることや使用形態に合わせて
補助装置を設置することは本発明の空気浄化触媒の機能
を損なわない限度において許容される。たとえば、本発
明の空気浄化触媒をハウジング内に設置すること、紫外
線を照射する紫外線ランプを併設すること、そして空気
浄化触媒に空気を送風する送風機を併設すること等がで
きる。The air purification catalyst of this embodiment has a substrate, an adsorbent layer carried on the surface of the substrate, and a photocatalyst layer carried on the adsorbent layer. Then, the air purification catalyst, the addition of any configuration other than the base material and the adsorbent layer and the photocatalyst layer carried on the base material, and the installation of an auxiliary device according to the usage form of the air purification catalyst of the present invention It is acceptable as long as the function is not impaired. For example, the air purification catalyst of the present invention can be installed in a housing, an ultraviolet lamp for irradiating ultraviolet rays can be provided, and a blower for blowing air to the air purification catalyst can be provided.
【００１５】基材は、吸着剤層と光触媒層とを安定して
保持し、空気浄化触媒として使用可能な強度を付与する
ものである。したがって基材に使用可能な材質としては
自立的に形状を保持できる強度を有し、空気浄化触媒と
しての使用環境下において化学的および物理的に安定で
ある材料であれば特に限定されない。たとえば、アルミ
ニウム等の金属、セラミックス、天然高分子、および合
成高分子が好ましい材料として挙げられる。そして、基
材にゼオライト等の吸着剤や、酸化チタン等の光触媒を
含有させてもよい。The base material stably holds the adsorbent layer and the photocatalyst layer and imparts strength that can be used as an air purification catalyst. Therefore, the material that can be used for the base material is not particularly limited as long as it has a strength capable of maintaining its shape autonomously and is chemically and physically stable under the use environment as an air purification catalyst. For example, metals such as aluminum, ceramics, natural polymers, and synthetic polymers are preferable materials. Then, the base material may contain an adsorbent such as zeolite or a photocatalyst such as titanium oxide.
【００１６】そして基材の形状についても光触媒層の少
なくとも一部に光が照射されるような形状であれば特に
限定されるものではない。ただし、吸着剤、光触媒とも
有害物質除去能は表面積に比例するので、基材は比表面
積の大きい形状とすることが好ましい。たとえば、ハニ
カム形状、ペレット形状、スポンジ等のような多孔質形
状、紙等のような薄膜、繊維状物から形成した布、およ
びこれらの二次加工品が好ましい形状として挙げられ
る。二次加工品としては、シート状の基材をジャバラ
状、波形状、円筒状等が好ましい形状として挙げられ
る。The shape of the substrate is not particularly limited as long as at least a part of the photocatalyst layer is irradiated with light. However, since the harmful substance removing ability of both the adsorbent and the photocatalyst is proportional to the surface area, it is preferable that the substrate has a large specific surface area. For example, a honeycomb shape, a pellet shape, a porous shape such as a sponge, a thin film such as paper, a cloth formed from a fibrous material, and a secondary processed product thereof are preferable. Examples of the secondary processed product include a sheet-shaped base material having a bellows shape, a corrugated shape, a cylindrical shape, or the like as a preferable shape.
【００１７】吸着剤層は、空気中の有害物質を吸着する
ことにより空気中の有害物質を除去する働きをもつもの
である。すなわち、吸着剤層は、空気中の有害物質濃度
が高い場合に、一時的に有害物質を吸着し、その後、放
出することで、有害物質の分解を行う光触媒層における
負荷を平均化させるものである。なお、吸着剤層への有
害物質の吸着は、不可逆的な場合もある。The adsorbent layer has a function of removing harmful substances in the air by absorbing harmful substances in the air. That is, when the concentration of harmful substances in the air is high, the sorbent layer temporarily absorbs the harmful substances and then releases them, thereby averaging the load on the photocatalyst layer that decomposes the harmful substances. is there. The adsorption of the harmful substance to the adsorbent layer may be irreversible.
【００１８】吸着剤層は、吸着剤と、バインダとを含
む。吸着剤層の厚みは、好ましくは５μｍ〜７００μｍ
程度、より好ましくは１０μｍ〜３５０μｍ程度の厚さ
とすることが好ましい。The adsorbent layer contains an adsorbent and a binder. The thickness of the adsorbent layer is preferably 5 μm to 700 μm
The thickness is preferably about 10 μm to 350 μm.
【００１９】吸着剤は、比表面積の大きいものがであれ
ばよい。その中でもゼオライト、活性炭、およびこれら
の混合物を用いることが好ましい。The adsorbent may have a large specific surface area. Among them, it is preferable to use zeolite, activated carbon, and a mixture thereof.
【００２０】バインダは、吸着剤と吸着剤および吸着剤
と基材とを結合させる働きがあるものならば、特に限定
されるものではない。たとえば、チタニア系バインダ、
シリカ系バインダ、アルミナ系バインダ、およびこれら
の混合物が挙げられる。この中でもチタニア系バインダ
を用いることが、光触媒としての作用も期待できるので
好ましい。The binder is not particularly limited as long as it has a function of binding the adsorbent to the adsorbent and the adsorbent to the base material. For example, titania binders,
Examples include silica-based binders, alumina-based binders, and mixtures thereof. Among them, the use of a titania-based binder is preferable because the action as a photocatalyst can be expected.
【００２１】さらに、吸着剤層には、光触媒としての機
能を吸着剤層にも付与する目的で酸化チタン等の光触媒
を含有させたり、空気浄化触媒の機械的強度を向上させ
るためにマイカ等からなるフィラー等の強化材を加える
こともできる。Further, the adsorbent layer contains a photocatalyst such as titanium oxide for the purpose of imparting the function as a photocatalyst to the adsorbent layer, or mica or the like for improving the mechanical strength of the air purification catalyst. A reinforcing material such as a filler can also be added.
【００２２】基材表面への吸着剤層の担持方法は、吸着
剤とバインダとを溶解ないし懸濁させた溶液をあらかじ
め調製して、その溶液を基材表面に直接塗布、乾燥して
吸着剤層を形成する方法、その溶液中に基材を浸漬、乾
燥して基材表面に吸着剤層を形成する方法、もしくは溶
液を使用せずに吸着剤とバインダとを混合した混合粉末
を基材表面に圧着させて吸着剤層を形成してもよい。The method of supporting the adsorbent layer on the surface of the base material is as follows: a solution in which the adsorbent and the binder are dissolved or suspended is prepared in advance, and the solution is directly applied to the surface of the base material and dried to dry the adsorbent. A method of forming a layer, a method of immersing and drying a substrate in a solution thereof to form an adsorbent layer on the surface of the substrate, or a method of mixing a mixed powder obtained by mixing an adsorbent and a binder without using a solution. The adsorbent layer may be formed by being pressed against the surface.
【００２３】なお、吸着剤層は、基材と明確に区別でき
る独立した層とする必要はなく、前述のように基材に吸
着剤を含有させた場合には、基材に吸着剤を含有させる
ことで基材の一部ないし全部を吸着剤層とすることもで
きる。The adsorbent layer does not need to be an independent layer that can be clearly distinguished from the substrate. When the adsorbent is contained in the substrate as described above, the adsorbent is contained in the substrate. By doing so, part or all of the substrate can be used as the adsorbent layer.
【００２４】たとえば、基材に脱臭紙を用いることによ
り基材の表面に別に吸着剤層を形成する必要はなくな
る。ここで脱臭紙とは、活性炭、ゼオライト、セピオラ
イト等を含有する紙である。その製造方法としては、公
知の紙の材料中に前記の活性炭等を混合し、一緒に抄紙
する方法が例として挙げられる。For example, by using deodorized paper for the substrate, it is not necessary to separately form an adsorbent layer on the surface of the substrate. Here, the deodorized paper is a paper containing activated carbon, zeolite, sepiolite and the like. Examples of the production method include a method of mixing the above-mentioned activated carbon and the like in a known paper material and making the paper together.
【００２５】したがって、本明細書において「基材の表
面に吸着剤層を担持させる」とは、基材の内部に吸着剤
層を担持させ、基材と吸着剤層とを一体とすることをも
含む。Therefore, in the present specification, "supporting the adsorbent layer on the surface of the base material" means that the adsorbent layer is supported inside the base material and the base material and the adsorbent layer are integrated. Including.
【００２６】光触媒層は、光触媒と、チタニア系バイン
ダとを含む。光触媒層は、光を照射することによって、
その表面に活性中心が生成して空気中に存在する有害物
質を分解することができる。The photocatalyst layer contains a photocatalyst and a titania-based binder. The photocatalyst layer, by irradiating light,
Active centers are formed on the surface, and harmful substances existing in the air can be decomposed.
【００２７】このように基材および吸着層としての脱臭
紙表面に光触媒層を形成することで紙に酸化チタンを漉
き込む場合と比較してより少ない酸化チタンの量で光触
媒能の高い紙状の空気浄化触媒を得ることができる。By forming the photocatalyst layer on the surface of the deodorized paper as the substrate and the adsorbing layer in this way, a paper-like material having a high photocatalytic activity can be obtained with a smaller amount of titanium oxide as compared with the case where titanium oxide is squeezed into paper. An air purification catalyst can be obtained.
【００２８】光触媒としては、光が照射されることによ
り活性化されて、空気中の有害物質を分解する酸化チタ
ンを用いる。用いる酸化チタンは、アナターゼ型の酸化
チタンを用いることがより好ましい。アナターゼ型の酸
化チタンは、ルチル型の酸化チタンと比較して光触媒と
しての活性が高いからである。As the photocatalyst, titanium oxide which is activated by light irradiation and decomposes harmful substances in the air is used. As the titanium oxide to be used, it is more preferable to use anatase type titanium oxide. This is because anatase-type titanium oxide has a higher activity as a photocatalyst than rutile-type titanium oxide.
【００２９】チタニア系バインダは、チタン化合物、有
機チタン化合物、もしくは有機チタン化合物とその他の
化合物との混合物であって、酸化チタンと酸化チタンお
よび酸化チタンと吸着剤層とを結合することができる物
質であればどのような物質であるかは特に限定されな
い。チタニア系バインダとしては、たとえばチタンアル
コキシド、酸化チタンゾル（たとえば、石原産業製ＳＴ
Ｓ−０１、ＳＴＳ−０２、多木化学製Ａ−６、Ｍ−
６）、酸化チタンゾルに無機バインダを含む酸化チタン
ゾル（たとえば、多木化学製ＣＡ−６２）、酸化チタン
に金属アルコキシドを含む酸化チタンゾル（たとえば、
多木化学製タイノックＣＺＧ、ＣＺＰタイプ；金属アル
コキシドとしてエチルポリシリケートを使用している）
等が挙げられる。The titania-based binder is a titanium compound, an organic titanium compound, or a mixture of an organic titanium compound and another compound, and is a substance capable of binding titanium oxide to titanium oxide and titanium oxide to an adsorbent layer. If so, what kind of substance is not particularly limited. Examples of the titania-based binder include titanium alkoxide and titanium oxide sol (for example, ST manufactured by Ishihara Sangyo).
S-01, STS-02, A-6 manufactured by Taki Kagaku, M-
6), a titanium oxide sol containing an inorganic binder in the titanium oxide sol (for example, CA-62 manufactured by Taki Kagaku), a titanium oxide sol containing a metal alkoxide in the titanium oxide (for example,
Taiki Chemical's Tynoc CZG, CZP type; uses ethyl polysilicate as metal alkoxide)
And the like.
【００３０】光触媒層に必要に応じて、さらに、その他
の物質を含有させることは、光触媒の光触媒能を損なわ
ないものであれば許容される。たとえば、酸化チタンに
活性中心を生成させる波長の光を減衰させる物質でなけ
れば混合可能である。It is permissible for the photocatalyst layer to further contain other substances, if necessary, as long as the photocatalytic ability of the photocatalyst is not impaired. For example, they can be mixed as long as they do not attenuate light having a wavelength that generates active centers in titanium oxide.
【００３１】光触媒層の吸着剤層上への担持方法は、あ
らかじめ調製した光触媒とチタニア系バインダとを溶解
ないし懸濁させた溶液を吸着剤層を形成した基材表面に
塗布、乾燥する方法およびその溶液中に吸着剤層を形成
した基材を浸漬、乾燥する方法や、溶液を用いないで光
触媒とチタニア系バインダとを混合した粉末を吸着剤層
を形成した基材表面に圧着してもよい。The method for supporting the photocatalyst layer on the adsorbent layer includes a method in which a solution prepared by dissolving or suspending a previously prepared photocatalyst and a titania-based binder is applied to the surface of the base material on which the adsorbent layer is formed, and dried. The method of immersing and drying the substrate on which the adsorbent layer is formed in the solution, or a method in which a powder obtained by mixing a photocatalyst and a titania binder without using a solution is pressed against the surface of the substrate on which the adsorbent layer is formed. Good.
【００３２】（変形態様）本発明の空気浄化用触媒は、
シート状に成形して、その片面に脱臭紙で制作した脱臭
体を接合することができる。脱臭体は、図１に示すよう
に、波状に加工した脱臭紙と、平面状の脱臭紙を何枚か
交互に接合したものである。(Modification) The air purifying catalyst of the present invention comprises:
It can be formed into a sheet and a deodorizing body made of deodorizing paper can be joined to one side. As shown in FIG. 1, the deodorizing body is formed by alternately joining several sheets of deodorized paper processed in a wave shape and deodorized paper in a planar shape.
【００３３】この脱臭体を接合することで脱臭体が空気
中の有害物質を一時的に吸着することによって光触媒の
みでは有害物質の分解・吸着が足りない場合に補助する
ことができる。また、この脱臭体を接合した光触媒は、
光触媒の能力をほとんど損なうことなくさらに有害物質
を大量に吸着することが可能であると同時に、脱臭体の
みでは、脱臭体に吸着された有害物質は、周囲の有害物
質濃度が低下したり、吸着が飽和すると有害物質を再放
出もしくは吸着できないことがあったが、光触媒と組み
合わせることによって有害物質が再放出されることがな
くなるという利点がある。By joining this deodorant, the deodorant temporarily adsorbs harmful substances in the air, so that it is possible to assist in the case where decomposition and adsorption of harmful substances are not sufficient with the photocatalyst alone. In addition, the photocatalyst bonded with this deodorant has
It is possible to adsorb a large amount of harmful substances without substantially impairing the performance of the photocatalyst.At the same time, if only the deodorant is used, the concentration of harmful substances adsorbed by the deodorant decreases, and the concentration of harmful substances in the surroundings decreases. In some cases, the harmful substance cannot be re-emitted or adsorbed when is saturated. However, there is an advantage that the harmful substance is not re-emitted by combining with a photocatalyst.
【００３４】[0034]
【実施例】以下に、試験例、実施例により本発明を具体
的に説明するが、本発明はこの試験例、実施例により何
ら制限を受けるものではないことはいうまでもない。EXAMPLES The present invention will now be described in detail with reference to Test Examples and Examples, but it goes without saying that the present invention is not limited by these Test Examples and Examples.
【００３５】（試験例） 〈触媒の調製〉触媒基材は、アルミニウム製ハニカム担
体を用いた。(Test Example) <Preparation of Catalyst> As a catalyst substrate, an aluminum honeycomb carrier was used.
【００３６】この基材表面に吸着剤層を担持した。吸着
剤層は、吸着剤としてゼオライトおよび活性炭と、バイ
ンダとしてシリカゾルとを用いた。これらを表１に示す
組成のスラリーとし、そのスラリー中に、アルミニウム
製ハニカム担体を浸漬した。ついで１２０℃にて乾燥
し、さらに２５０℃にて熱処理することにより担体表面
にコーティングした。An adsorbent layer was carried on the surface of the substrate. The adsorbent layer used zeolite and activated carbon as an adsorbent, and silica sol as a binder. These were made into a slurry having the composition shown in Table 1, and an aluminum honeycomb carrier was immersed in the slurry. Subsequently, it was dried at 120 ° C. and further heat-treated at 250 ° C. to coat the carrier surface.
【００３７】[0037]
【表１】 [Table 1]
【００３８】そして、コーティングした吸着剤層上にさ
らに光触媒層をコーティングした。光触媒層は、光触媒
として酸化チタンと、チタニア系バインダとしてチタニ
アゾルとを用いた。これらを表２に示す組成のスラリー
とし、そのスラリー中に、吸着剤をコーティングしたハ
ニカムを浸漬した。ついで１２０℃にて乾燥し、さらに
２５０℃にて熱処理することにより吸着剤層表面にコー
ティングした。Then, a photocatalyst layer was further coated on the coated adsorbent layer. The photocatalyst layer used titanium oxide as a photocatalyst and titania sol as a titania-based binder. These were made into a slurry having the composition shown in Table 2, and a honeycomb coated with an adsorbent was immersed in the slurry. Then, it was dried at 120 ° C. and further heat-treated at 250 ° C. to coat the surface of the adsorbent layer.
【００３９】[0039]
【表２】 [Table 2]
【００４０】〈評価方法〉調製した各触媒をそれぞれ別
の空気清浄機（シャープ製：型式Ｆｕ−ＦＷ３Ｋ）に組
み込んだ。光源は、冷陰極ランプ（４Ｗ）を２本使用し
た。光の波長は、ＵＶ−Ａ（３２０ｎｍ〜３８０ｎｍ）
にピーク波長をもつものである。設置触媒表面近傍の紫
外線強度は、紫外線強度計（スペクトロニクス社（米
国）：型式ＤＲＣ−１００Ｈ）を用い、波長域３２０ｎ
ｍ〜４００ｎｍのセンサにより測定した結果、０．８ｍ
Ｗ／ｃｍ2であった。この条件は、すべて同一とした。<Evaluation Method> Each of the prepared catalysts was incorporated in a separate air purifier (model Fu-FW3K, manufactured by Sharp). As the light source, two cold cathode lamps (4 W) were used. The wavelength of the light is UV-A (320 nm to 380 nm)
Has a peak wavelength. The ultraviolet intensity near the surface of the installed catalyst was measured using an ultraviolet intensity meter (Spectronics (USA): Model DRC-100H), and the wavelength range was 320 n.
0.8 m as a result of measurement with a sensor of m to 400 nm.
W / cm 2 . These conditions were all the same.
【００４１】それぞれの空気清浄機をそれぞれ内部を温
度２４〜２８℃、湿度約５０％、ＮＯ濃度を空気中に１
０ｐｐｍとした内容積１立方メートルの透明アクリル製
容器中に設置した（２％ＮＯ入り窒素を常圧で５００ｍ
Ｌ注入した。）。経時的に、容器中の気体を採取して化
学発光法によりＮＯ濃度を測定した。The inside of each air purifier is heated to a temperature of 24 to 28 ° C., a humidity of about 50%, and a NO concentration of 1 in air.
It was set in a transparent acryl container having an internal volume of 1 cubic meter with a volume of 0 ppm (nitrogen containing 2% NO was 500 m at normal pressure).
L was injected. ). Over time, the gas in the container was sampled and the NO concentration was measured by a chemiluminescence method.
【００４２】そして、空気清浄機を設置しないものを対
照とした。A control without an air purifier was used as a control.
【００４３】〈結果〉ＮＯ濃度の経時的変化を図１に示
す。空気浄化触媒を設けている実施例１、２および比較
例のＮＯ濃度は、すべての時間において対照におけるＮ
Ｏ濃度より低かった。そして、光触媒層にチタニア系バ
インダを用いている実施例１、２では、比較例よりもＮ
Ｏ濃度が著しく低下していた。また、実施例１、２の間
においてもバインダをすべてチタニア系バインダとして
いる実施例１がバインダの一部にシリカ系バインダを残
している実施例２よりもＮＯ濃度の低下が大きかった。<Results> FIG. 1 shows the change over time of the NO concentration. The NO concentrations of Examples 1 and 2 and the Comparative Example in which the air purification catalyst was provided were the same as those of the control at all times.
It was lower than the O concentration. In Examples 1 and 2 in which a titania-based binder was used for the photocatalyst layer, N was larger than that in Comparative Example.
The O concentration was significantly reduced. Also, between Examples 1 and 2, Example 1 in which the binder was all titania-based binders showed a larger decrease in NO concentration than Example 2 in which the silica-based binder was left in part of the binder.
【００４４】以上の結果から、光触媒層中のバインダの
種類をチタニア系バインダとすることにより空気浄化触
媒の触媒能が向上することが明らかとなった。また、光
触媒層のバインダの一部のみであってもシリカ系バイン
ダからチタニア系バインダに置換することによって空気
浄化能力が向上することが明らかとなった。From the above results, it was clarified that the catalytic performance of the air purification catalyst was improved by using a titania-based binder as the binder in the photocatalyst layer. Further, it has been clarified that even if only a part of the binder of the photocatalyst layer is replaced with the titania-based binder from the silica-based binder, the air purification ability is improved.
【００４５】[0045]
【発明の効果】本発明の空気浄化触媒は、従来の空気浄
化触媒と比較したときに、より空気浄化機能が高いとい
う効果を有する。The air purifying catalyst of the present invention has an effect that the air purifying function is higher than that of the conventional air purifying catalyst.
【図１】本発明の実施形態を示した図である。FIG. 1 is a diagram showing an embodiment of the present invention.
【図２】実施例、比較例、対照実験におけるＮＯ濃度の
経時変化を示したグラフである。FIG. 2 is a graph showing time-dependent changes in NO concentration in Examples, Comparative Examples, and Control Experiments.
１…空気浄化触媒 ２…脱臭紙 1. Air purification catalyst 2. Deodorized paper
───────────────────────────────────────────────────── フロントページの続き (72)発明者 隅田 健二 静岡県小笠郡大東町千浜7800番地 株式会 社キャタラー内 Ｆターム(参考） 4C080 AA05 AA07 BB02 HH05 LL03 MM02 MM04 MM06 NN03 QQ03 4D048 AA22 AB03 BA03Y BA05X BA05Y BA07X BA07Y BA11X BA11Y BB02 4G069 AA03 BA04A BA04B BA04C BA07A BA07B BA08A BA08B BA08C BA37 BA48A BA48C BC16B CA01 CA17 EA18 FB13 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Sumida 7800 Chihama, Daito-cho, Ogasa-gun, Shizuoka Prefecture F-term in Cataler Co., Ltd. 4C080 AA05 AA07 BB02 HH05 LL03 MM02 MM04 MM06 NN03 QQ03 4D048 AA22 AB03 BA03Y BA05X BA05Y BA07X BA07Y BA11X BA11Y BB02 4G069 AA03 BA04A BA04B BA04C BA07A BA07B BA08A BA08B BA08C BA37 BA48A BA48C BC16B CA01 CA17 EA18 FB13
Claims (4)
層と、該吸着剤層上に担持された酸化チタン粒子と該酸
化チタンを結合するチタニア系化合物からなるバインダ
とを含む光触媒層と、を有することを特徴とする空気浄
化触媒。1. A method comprising: a base material; an adsorbent layer supported on the surface of the base material; and a titanium oxide particle supported on the adsorbent layer and a binder made of a titania-based compound that binds the titanium oxide. An air purification catalyst, comprising: a photocatalyst layer.
で形成されたものである請求項１記載の空気浄化触媒。2. The air purification catalyst according to claim 1, wherein the titania-based compound is formed of a titania sol.
るバインダをさらに含む請求項１記載の空気浄化触媒。3. The air purification catalyst according to claim 1, wherein the photocatalyst layer further includes a binder made of a silica-based compound.
活性炭粒子のうち少なくとも一種を含む吸着剤粒子をバ
インダで結合したものである請求項１記載の空気浄化触
媒。4. The air purification catalyst according to claim 1, wherein the adsorbent layer is formed by binding adsorbent particles containing at least one of zeolite particles and activated carbon particles with a binder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35447199A JP2001170497A (en) | 1999-12-14 | 1999-12-14 | Catalyst for cleaning air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35447199A JP2001170497A (en) | 1999-12-14 | 1999-12-14 | Catalyst for cleaning air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001170497A true JP2001170497A (en) | 2001-06-26 |
Family
ID=18437794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35447199A Pending JP2001170497A (en) | 1999-12-14 | 1999-12-14 | Catalyst for cleaning air |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001170497A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005066433A (en) * | 2003-08-22 | 2005-03-17 | Kusatsu Electric Co Ltd | Photocatalyst molding |
| JP2005290369A (en) * | 2004-03-10 | 2005-10-20 | Central Japan Railway Co | Titanium oxide-coating agent, and forming method for titanium oxide-coating film |
| CN101537201A (en) * | 2009-04-27 | 2009-09-23 | 贺燕婷 | Multieffect nano air purificant and preparation method thereof |
| US8048511B2 (en) | 2005-03-09 | 2011-11-01 | Central Japan Railway Company | Titanium oxide coating agent and titanium oxide film forming method |
| US20130121890A1 (en) * | 2011-11-15 | 2013-05-16 | Photo & Environmental Technology Co. | Photocatalyst-containing filter material, and photocatalyst filter including the filter material |
| JP2019520203A (en) * | 2016-06-13 | 2019-07-18 | エルジー・ハウシス・リミテッドＬｇ Ｈａｕｓｙｓ，Ｌｔｄ． | Photocatalytic functional filter |
| JP2021159825A (en) * | 2020-03-31 | 2021-10-11 | 国立研究開発法人産業技術総合研究所 | Photocatalyst body and production method thereof |
-
1999
- 1999-12-14 JP JP35447199A patent/JP2001170497A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005066433A (en) * | 2003-08-22 | 2005-03-17 | Kusatsu Electric Co Ltd | Photocatalyst molding |
| JP2005290369A (en) * | 2004-03-10 | 2005-10-20 | Central Japan Railway Co | Titanium oxide-coating agent, and forming method for titanium oxide-coating film |
| US8048511B2 (en) | 2005-03-09 | 2011-11-01 | Central Japan Railway Company | Titanium oxide coating agent and titanium oxide film forming method |
| CN101537201A (en) * | 2009-04-27 | 2009-09-23 | 贺燕婷 | Multieffect nano air purificant and preparation method thereof |
| US20130121890A1 (en) * | 2011-11-15 | 2013-05-16 | Photo & Environmental Technology Co. | Photocatalyst-containing filter material, and photocatalyst filter including the filter material |
| JP2019520203A (en) * | 2016-06-13 | 2019-07-18 | エルジー・ハウシス・リミテッドＬｇ Ｈａｕｓｙｓ，Ｌｔｄ． | Photocatalytic functional filter |
| JP2021159825A (en) * | 2020-03-31 | 2021-10-11 | 国立研究開発法人産業技術総合研究所 | Photocatalyst body and production method thereof |
| JP7462926B2 (en) | 2020-03-31 | 2024-04-08 | 国立研究開発法人産業技術総合研究所 | Photocatalyst and its manufacturing method |
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