Nippon Kayaku Kabushiki Kaisha

Hiroyoshi Nowatari

Katsutoshi Takahashi

Yasuo Kuroda

Hiroshi Hayami

Sumio Yoda

Atsushi Sudo

Kazuo Shiraishi

Fumio Sakai

Tatsuhiko Kurakami

Hideki Sugi

Yoshimasa Seo

Tomoaki Kobayashi

Koichi Wada

Akira Iwamoto

An object of the present invention is to provide a process for stably producing a catalyst for methacrylic acid production exhibiting high activity and high performance. The process for producing a catalyst for methacrylic acid production of the invention is characterized in that the water content of the catalyst ingredient powder for use in molding, temperature and humidity of a molding step, humidity and temperature of a baking step are individually controlled in the case where molding is performed by a coating method using an Mo&#x2014;V&#x2014;P&#x2014;Cu-based hetero polyacid as an active ingredient and water or an alcohol and/or an aqueous solution of an alcohol as a binder.

Process for producing catalyst for methacrylic acid production and process for producing methacrylic acid

Producing acrolein and acrylic acid using a supported dual activity

A diamine platinum (II) complex represented by the general formula ##STR1## [wherein R.sub.1 and R.sub.2 are each a lower alkyl group; and two X's are each a halogen atom or jointly form a group represented by ##STR2## (wherein R.sub.3 and R.sub.4 are each a hydrogen atom or a lower alkyl group) or a group represented by ##STR3## (wherein m is 1 or 2)].

Platinum complexes

A diamine platinum (II) complex represented by the general formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a hydrogen atom or a lower alkyl group; and two X's are each a halogen atom or jointly form a group represented by ##STR2## wherein R.sub.5 and R.sub.6 are each a hydrogen atom or a lower alkyl group of a group represented by ##STR3## wherein m is 1 or 2.

Novel platinum complexes

A diamine platinum (II) complex represented by the general formula ##STR1## [wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each a hydrogen atom or a lower alkyl group; and two X's are each a halogen atom or jointly form a group represented by ##STR2## (wherein R.sub.5 and R.sub.6 are each a hydrogen atom or a lower alkyl group) or a group represented by ##STR3## (wherein m is 1 or 2)].

Platinum Complexes

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Takasaki, Japan

Hiroyoshi Nowatari