Ag<sub>2</sub>S<sub>2</sub>O<sub>8</sub> meets AgSO<sub>4</sub>: the second example of metal–ligand redox isomerism among inorganic systems
作者:Tomasz E. Gilewski、Piotr J. Leszczyński、Armand Budzianowski、Zoran Mazej、Adam Grzelak、Tomasz Jaroń、Wojciech Grochala
DOI:10.1039/c6dt03283d
日期:——
only one documented case, that of PbS2 which adopts two polymorphic forms corresponding to Pb(IV)(S2−)2 and Pb(II)(S22−). Here we have taken advantage of metathetic reactions using salts of weakly coordinating anions and we have prepared for the first time Ag(I)2S2O8, silver(I) peroxydisulphate. The title compound crystallizes in the non-centrosymmetric Cc space group with partial disorder of the anionic
在纯无机体系中,基于金属与配体之间电子交换的化合价(氧化还原)异构体极为罕见,只有一个文献记载的案例是PbS 2,它采用两种对应于Pb(IV)(S 2-)2的多晶型形式。和Pb(II)(S 2 2-)。在这里,我们利用了弱配位阴离子的盐进行的置换反应,并首次制备了Ag(I)2 S 2 O 8,过氧化二硫酸银(I)。标题化合物在非中心对称的Cc中结晶阴离子亚晶格局部紊乱的空间群。Ag(I)2 S 2 O 8是反铁磁性黑色Ag(II)SO 4的高度热不稳定的反磁性和无色化合价异构体,我们过去曾描述过。
Anhydrous processing of methane into methane-sulfonic acid, methanol, and other compounds
申请人:Richards K. Alan
公开号:US20050070614A1
公开(公告)日:2005-03-31
Anhydrous processing to convert methane into oxygenates (such as methanol), liquid fuels, or olefins uses an initiator to create methyl radicals. These radicals combine with sulfur trioxide to form methyl-sulfonate radicals. These radicals attack fresh methane, forming stable methane-sulfonic acid (MSA) while creating new methyl radicals to sustain a chain reaction. This system avoids the use or creation of water, and liquid MSA is an amphoteric solvent that increasing the solubility and reactivity of methane and SO
3
. MSA from this process can be sold or used as a valuable chemical with no mercaptan or halogen impurities, or it can be heated and cracked to release methanol (a clean fuel, gasoline additive, and chemical feedstock) and sulfur dioxide (which can be oxidized to SO
3
and recycled back into the reactor). MSA also can be converted into gasoline, olefins, or other valuable chemicals.
Process for producing anhydrous peroxydisulfuric, acid using sulfur trioxide recovered from a waste comprising sulfuric acid
申请人:Martin Roy William
公开号:US20100010259A1
公开(公告)日:2010-01-14
A process for producing peroxydisulfuric acid from a waste comprising substantially sulfuric acid, whereby the sulfuric acid is separated into sulfur trioxide and substantially water which is removed as a waste. The recovered sulfur trioxide is reacted with hydrogen peroxide to produce peroxydisulfuric acid which is fed to a methane-sulfonation process resulting in formation of sulfuric acid radicals. The sulfuric acid radicals react with methane producing methane radicals resulting in formation of sulfuric acid. The sulfuric acid from the methane-sulfonation process is recovered, reprocessed, and the process is repeated.
A method of processing a semiconductor wafer sliced from a single-crystal ingot and having front and back surfaces and a peripheral edge comprises the step of plasma jet etching the wafer to reduce the sub-surface wafer damage. The method further comprises high-gloss etching the wafer by subjecting the wafer to a high-gloss etchant that smooths the wafer such that surface roughness and nonspecularly reflected light are reduced. Plasma assisted chemical etching (PACE) is performed on the wafer to improve the flatness and the thickness uniformity of the wafer. The wafer is final polished to further reduce surface roughness and nonspecularly reflected light.
Sulfuric Acid Recycling Type Cleaning System and a Sulfuric Acid Recycling Type Persulfuric Acid Supply Apparatus
申请人:Nagai Tatsuo
公开号:US20080251108A1
公开(公告)日:2008-10-16
If incorporated in a cleaning system using persulfuric acid, the invention serves for continuous cleaning while increasing the persulfuric acid concentration adequately to ensure enhanced cleaning performance. The invention provides a feeding apparatus that feeds persulfuric acid to a cleaning apparatus. The cleaning system uses an electrolysis reactor
10
that regenerates the persulfuric acid solution by performing electrolytic reaction to produce persulfate ions from sulfate ions contained in the solution, and a circulation line
4, 5, 6
that circulates the persulfuric acid solution between the cleaning vessel
1
and the electrolysis reactor
10.
Configured as above, the invention can provides a feeding apparatus. The cleaning system comprises said configuration and a cleaning vessel
1
that cleans objects
30
using a persulfuric acid solution
2
as cleaning fluid.