acid properties
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Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 112
Sławomir J. Grabowski

The MP2/aug-cc-pVTZ calculations were performed on the dihalometallylenes to indicate their Lewis acid and Lewis base sites. The results of the Cambridge Structural Database search show corresponding and related crystal structures where the tetrel center often possesses the configuration of a trigonal bipyramid or octahedron. The calculations were also carried out on dimers of dichlorogermylene and dibromogermylene and on complexes of these germylenes with one and two 1,4-dioxide molecules. The Ge⋯Cl, Ge⋯Br, and Ge⋯O interactions are analyzed. The Ge⋯O interactions in the above mentioned germylene complexes may be classified as the π-hole tetrel bonds. The MP2 calculations are supported by the results of the Quantum Theory of Atoms in Molecules (QTAIM) and the Natural Bond Orbital (NBO) approaches.

2022 ◽  
Vol 1049 ◽  
pp. 232-239
Sherzod Ataullaev ◽  
Bobokhon Mavlanov ◽  
Sadriddin Fozilov ◽  
Farkhod Bobokulov ◽  
Hasan Fozilov

The article presents a systematic analysis and simulation of the process of destructive hydrogenation of deasphalted oil. The process of thermoregeneration of spent zeolite and the surface - acid properties of CaA zeolite catalysts are also studied. It has been established that such patterns that allow predicting their influence and to regulate the quality of the hydrogenation obtained on one or another form of the catalyst obtained from the studied factors and catalysts. In addition, the obtained data can be used in the search for the optimal process modes of the process under consideration on the specific form of the catalyst.

Jihui Yao ◽  
Yuzi Rong ◽  
Zeyan Gao ◽  
Xiaohua Tang ◽  
Fei Zha ◽  

To introduce the hierarchical porous structure into SAPO-34 zeolites, adjust acid properties and crystalline size of SAPO-34 zeolites, a series of Zr-modified SAPO-34 zeolites (Zrx-SAPO-34 (x = 0.25, 0.50 and...

2021 ◽  
Vol 25 (2) ◽  
pp. 435-468
Dániel Balázs Rátai ◽  
Zoltán Horváth ◽  
Zoltán Porkoláb ◽  
Melinda Tóth

Atomicity, consistency, isolation and durability are essential properties of many distributed systems. They are often abbreviated as the ACID properties. Ensuring ACID comes with a price: it requires extra computing and network capacity to ensure that the atomic operations are done perfectly, or they are rolled back. When we have higher requirements on performance, we need to give up the ACID properties entirely or settle for eventual consistency. Since the ambiguity of the order of the events, such algorithms can get very complicated since they have to be prepared for any possible contingencies. Traquest model is an attempt for creating a general concurrency model that can bring the ACID properties without sacrificing a too significant amount of performance.

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