Patent
Process for preparing silica-titania catalyst
Reads0
Chats0
TLDR
In this article, a process for preparing a silica-titania catalyst by adding an acidic solution containing a silicon compound such as sodium silicate and a titanium compound, such as titanium sulfate dissolved therein to a solution of a compound of ammonium bicarbonate to bring about co-precipitation is described.Abstract:
A process for preparing a silica-titania catalyst by adding an acidic solution containing a silicon compound such as sodium silicate and a titanium compound such as titanium sulfate dissolved therein to a solution of a compound such as ammonium bicarbonate to bring about co-precipitation, in which the acidic solution is a highly concentrated nitric acid-acidic or sulfuric acid-acidic solution, and a ratio of the dissolved titanium compound in the acidic solution is regulated in a certain range. According to this process, a catalyst capable of exerting a high performance in an esterification reaction and the like can be efficiently obtained.read more
Citations
More filters
Patent
Catalyst for wastewater treatment and method for wastewater treatment using said catalyst
Junichi Miyake,Tohru Ishii +1 more
TL;DR: In this paper, the authors proposed a method for wet oxidation treatment of wastewater using the catalyst, in particular the catalyst of the present invention can suitably be used in wet oxidation of wastewater, under high temperature and high pressure conditions.
Patent
A modified titanium dioxide and a method for its preparation
TL;DR: In this paper, a titanium dioxide composition modified with urea in the stage of the titanium hydroxide precipitation from an aqueous solution is described, which is characterized by an enhanced thermal and hydrothermal stability of the pore structure, a developped mesopore structure and a decreased sulfur content.
Patent
Silicon-containing titanium dioxyde, method for preparing the same and catalytic compositions thereof
TL;DR: In this article, a method for preparing thermally stable, silicon-containing titanium dioxide was proposed, comprising the reaction of titanium hydroxide or titanium dioxide with a silica sol, under conditions which prevent the coagulation of silica particles in said sol.
Patent
Method for producing photocatalyst material
Yasuhiro Hatano,Hiroki Miyamoto,Kei Miyamoto,Atsushi Kakitsuji,Toshikazu Nosaka,Akira Aoki,Tadashi Takatuka,Takeshi Ohara,Toshiaki Oura +8 more
TL;DR: In this article, the authors provided a process for preparing a photocatalyst material, the process comprising a first step of forming an undercoating containing silica gel on a substrate, a second step of bringing titanium tetrachloride into contact with the under-coating and a third step of heat-treating the coated substrate.
Patent
Process for preparing a carboxylic acid ester
TL;DR: In this article, a process for preparing a carboxylic acid ester which includes subjecting an alcohol or a phenol to an esterification reaction in the presence of a silica-titania catalyst is described.
References
More filters
Patent
Twice-aged porous inorganic oxides, catalysts, and polymerization processes
TL;DR: In this paper, a silica-titania cogel or silica titania-chromium tergel is first aged at a substantially neutral pH, then aged at an alkaline pH, and then spray dried or azeotrope dried to form a xerogel.
Patent
Process for the preparation of silica-titania and catalysts comprising the same
TL;DR: In this paper, high surface area, low bulk density silica-titania materials which are particularly effective as catalysts or catalyst supports are prepared by mixing a silicon alkoxide, a titanium alkoxide and an organic diluent.
Patent
Silica-titania cogel from two-step hydrolysis
TL;DR: A silica-titania cogel is produced in a two-step process where in the first step an alkyl polysilicate and/or a tetraalkyl silicate is partially hydrolyzed in an alkaline organic solvent using insufficient water to complete hydrolysis and in the second step an excess of water is added to complete the hydrolyisation as discussed by the authors.
Patent
Highly porous amorphous titania and titania/silica phases
TL;DR: In this paper, a highly porous amorphous titania or titania/silica material is provided by gelling a reaction mixture comprising hydrolyzable titanium and optionally, hydrolyzeable silicon compounds, such as titanium diisopropoxide (2,4-pentanedionate) and tetraethylorthosilicate.
Patent
Preparation of methacrylates
Takeru Onoda,Masayuki Otake +1 more
TL;DR: In this article, a methacrylate is prepared by reacting methacrylic acid and an alcohol in vapor phase in the presence of a catalyst, which is a solid acid catalyst of silica-titania obtained by coprecipitating the same from an aqueous solution of a silicon and a titanium compound.