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- Q6712068 subject Q7448347.
- Q6712068 subject Q8644583.
- Q6712068 abstract "In M-SG an alkali metal is absorbed into silica gel at elevated temperatures. The resulting black powder material is an effective reducing agent and safe to handle as opposed to the pure metal. The material can also be used as a desiccant and as a hydrogen source.The metal is either sodium or a sodium - potassium alloy (Na2K). The molten metal is mixed with silica gel under constant agitation at room temperature. This phase 0 material must be handled in an inert atmosphere. Heating phase 0 at 150 °C (302 °F) takes it to phase I. When this material is exposed to dry oxygen the reducing power is not affected. At further heating to 400 °C (752 °F) phase II can be handled safely in an ambient environment. The metal reacts with the silica gel in an exothermic reaction in which Na4Si4 nanoparticles are formed. The powder reacts with water to form hydrogen. Compounds such as biphenyl and naphthalene are reduced by the powder and form highly coloured radical anions. The powder can also be introduced in a column chromatography setup and eluted with organic reactants in order to probe the reducing power. The powder is mixed with additional (wet) silica gel which provides additional hydrogen. A Birch reduction of naphthalene takes 5 minutes elution time. The column converts benzyl chloride to bibenzyl in a Wurtz coupling and in a similar fashion dibenzothiophene is reduced to biphenyl.".
- Q6712068 thumbnail M-SG_reducing_agent.svg?width=300.
- Q6712068 wikiPageWikiLink Q111092.
- Q6712068 wikiPageWikiLink Q11468.
- Q6712068 wikiPageWikiLink Q13221746.
- Q6712068 wikiPageWikiLink Q179724.
- Q6712068 wikiPageWikiLink Q19557.
- Q6712068 wikiPageWikiLink Q1956404.
- Q6712068 wikiPageWikiLink Q1993452.
- Q6712068 wikiPageWikiLink Q205949.
- Q6712068 wikiPageWikiLink Q216830.
- Q6712068 wikiPageWikiLink Q308976.
- Q6712068 wikiPageWikiLink Q37756.
- Q6712068 wikiPageWikiLink Q410915.
- Q6712068 wikiPageWikiLink Q556.
- Q6712068 wikiPageWikiLink Q620361.
- Q6712068 wikiPageWikiLink Q658.
- Q6712068 wikiPageWikiLink Q684907.
- Q6712068 wikiPageWikiLink Q703.
- Q6712068 wikiPageWikiLink Q7448347.
- Q6712068 wikiPageWikiLink Q846734.
- Q6712068 wikiPageWikiLink Q8644583.
- Q6712068 wikiPageWikiLink Q864996.
- Q6712068 wikiPageWikiLink Q898901.
- Q6712068 wikiPageWikiLink Q908955.
- Q6712068 comment "In M-SG an alkali metal is absorbed into silica gel at elevated temperatures. The resulting black powder material is an effective reducing agent and safe to handle as opposed to the pure metal. The material can also be used as a desiccant and as a hydrogen source.The metal is either sodium or a sodium - potassium alloy (Na2K). The molten metal is mixed with silica gel under constant agitation at room temperature. This phase 0 material must be handled in an inert atmosphere.".
- Q6712068 label "M-SG reducing agent".
- Q6712068 depiction M-SG_reducing_agent.svg.