Homogeneous catalytic reduction of CO2 with hydrosilanes

2014 ◽  
Vol 4 (3) ◽  
pp. 611-624 ◽  
Author(s):  
Francisco J. Fernández-Alvarez ◽  
Abdullah M. Aitani ◽  
Luis A. Oro

Catalytic CO2 hydrosilylation is a chemical process that could be potentially applied to large-scale transformations.

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1099
Author(s):  
María José Rodríguez-Torres ◽  
Ainoa Morillas-España ◽  
José Luis Guzmán ◽  
Francisco Gabriel Acién

One of the most critical variables in microalgae-related processes is the pH; it directly determines the overall performance of the production system especially when coupling with wastewater treatment. In microalgae-related wastewater treatment processes, the adequacy of pH has a large impact on the microalgae/bacteria consortium already developing on these systems. For cost-saving reasons, the pH is usually controlled by classical On/Off control algorithms during the daytime period, typically with the dynamics of the system and disturbances not being considered in the design of the control system. This paper presents the modelling and pH control in open photobioreactors, both raceway and thin-layer, using advanced controllers. In both types of photobioreactors, a classic control was implemented and compared with a Proportional–Integral (PI) control, also the operation during only the daylight period and complete daily time was evaluated. Thus, three major variables already studied include (i) the type of reactors (thin-layers and raceways), (ii) the type of control algorithm (On/Off and PI), and (iii) the control period (during the daytime and throughout the daytime and nighttime). Results show that the pH was adequately controlled in both photobioreactors, although each type requires different control algorithms, the pH control being largely improved when using PI controllers, with the controllers allowing us to reduce the total costs of the process with the reduction of CO2 injections. Moreover, the control during the complete daily cycle (including night) not only not increases the amount of CO2 to be injected, otherwise reducing it, but also improves the overall performance of the production process. Optimal pH control systems here developed are highly useful to develop robust large-scale microalgae-related wastewater treatment processes.


2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Jiyun Heo ◽  
Jae-Yun Han ◽  
Soohyun Kim ◽  
Seongmin Yuk ◽  
Chanyong Choi ◽  
...  

Abstract The vanadium redox flow battery is considered one of the most promising candidates for use in large-scale energy storage systems. However, its commercialization has been hindered due to the high manufacturing cost of the vanadium electrolyte, which is currently prepared using a costly electrolysis method with limited productivity. In this work, we present a simpler method for chemical production of impurity-free V3.5+ electrolyte by utilizing formic acid as a reducing agent and Pt/C as a catalyst. With the catalytic reduction of V4+ electrolyte, a high quality V3.5+ electrolyte was successfully produced and excellent cell performance was achieved. Based on the result, a prototype catalytic reactor employing Pt/C-decorated carbon felt was designed, and high-speed, continuous production of V3.5+ electrolyte in this manner was demonstrated with the reactor. This invention offers a simple but practical strategy to reduce the production cost of V3.5+ electrolyte while retaining quality that is adequate for high-performance operations.


2021 ◽  
pp. 132322
Author(s):  
Ziqi Wang ◽  
Zhongqing Yang ◽  
Ruiming Fang ◽  
Yunfei Yan ◽  
Jingyu Ran ◽  
...  

Author(s):  
Jinrui Guo ◽  
Jing Tian ◽  
Jinhua Deng ◽  
Xinyu Yang ◽  
Binghui Duan ◽  
...  

Author(s):  
Huijuan Wang ◽  
Sha Bai ◽  
Pu Zhao ◽  
Tian Li ◽  
Chenjun Ning ◽  
...  

Synthesis of syngas (CO, H2) by photocatalytic reduction of CO2 and H2O represents an eco-friendly pathway for large-scale CO2 utilization for the production of chemical raw materials with high added...


Bibliosphere ◽  
2018 ◽  
pp. 39-47
Author(s):  
E. B. Artemyeva ◽  
I. G. Lakizo

Both the library education system and Russian education system as a whole undergo a period of large-scale transformations: changing concepts and technologies; revising educational standards of higher and secondary vocational education; developing the system of additional vocational training; forming the electronic educational environment in the practice of teaching students and listeners of the supplementary education system; searching ways for educational institutions and libraries joint development. It is advisable to create information and methodological support of activities in the field of continuous library education in such conditions. The database «Library Education Institutions» generated by SPSTL SB RAS is regarded to be a base of the unified information-educational space in the field of continuous library education, which information should be used to support the educational process of specialized institutions of all levels of education training and forms in the country. It represents the system of library education in the form of a hierarchy of different levels of education, a network of specialized educational institutions in the regions, different types of educational institutions, standard and individual educational curricula, etc. The database main objectives are the following: cumulating information; searching educational institutions, programs; providing statistical information on issues related to education in Russia. A user can create a model of continuous library education in a specific region and organize the work of educational institutions and libraries to improve the librarian professionalism applying the information provided by the database «Library Education Institutions» according to a complex query.


Author(s):  
Jawed Qaderi

The catalytic reduction of CO2 to methanol is an appealing option to reduce greenhouse gas concentration as well as renewable energy production. In addition, the exhaustion of fossil fuel, increase in earth temperature and sharp increases in fuel prices are the main driving factor for exploring the synthesis of methanol by hydrogenating CO2. Many studies on the catalytic hydrogenation of CO2 to methanol were published in the literature over the last few decades. Many of the studies have presented different catalysts having high stability, higher performance, low cost, and are immediately required to promote conversion. Understanding the mechanisms involved in the conversion of CO2 is essential as the first step towards creating these catalysts. This review briefly summarizes recent theoretical developments in mechanistic studies focused on using density functional theory, kinetic Monte Carlo simulations, and microkinetics modeling. Based on these simulation techniques on different transition metals, metal/metal oxide, and other heterogeneous catalysts surfaces, mainly, three important mechanisms that have been recommended are the formate (HCOO), reverse water–gas shift (RWGS), and trans-COOH mechanisms. Recent experimental and theoretical efforts appear to demonstrate that the formate route in which the main intermediate species is H2CO* in the reaction route, is more favorable in catalytic hydrogenation of CO2 to chemical fuels in various temperature and pressure conditions.


Istoriya ◽  
2021 ◽  
Vol 12 (7 (105)) ◽  
pp. 0
Author(s):  
Pavel Uvarov

In the seventeenth century, the search for the “forgotten” rights of the king were an important aid in organizing French expansion, mainly in the eastern and northeastern directions. At the sovereign courts of Lorraine, Alsace and Franche-Comté “chambers of annexations” (chambres d’annexion) were created in 1680 to organize search for archival documents supporting royal claims to neighboring lands. The idea of creating special institutions engaged in the search for documents revealing the precedents of relations with other countries and forgotten rights, that French king had supposedly enjoyed in those parts, was expressed back during the reign of Henry II. In 1556, Raoul Spifame, a lawyer at the Paris Parliament, published a book consisting of fictitious royal decrees, of which many would be implemented in the future. Among other things he ordered, on behalf of the king, the creation of thirty chambers, each specializing in the search for documents in the “treasury of charters” relating to a particular province. He had determined the composition of these chambers, the procedure for work and the form of reporting, — all this in order to arm the king with knowledge of his forgotten rights and the content of antique treaties and agreements. The nomenclature of “provincial chambers” is especially interesting, from the Chambers of Scotland and England to the Chamber of Tunisia and Africa, as well as the Chamber of Portugal and the New Lands. Much more attention was attracted by those lands to which a century later the French expansion would be directed: Franche-Comté, Artois and Flanders, Lorraine, the Duchy of Cleves. But more than half of chambers specialized in the Italian lands. This is not surprising, since in the 1550s France was entering the climax of the Italian Wars. Under Henry II (1547—1559) one of the four secretaries of state, Jean du Thier, was the person responsible for the southwestern direction of French policy. There is reason to believe that Spifame was associated with du Thier or with other members of the king’s “reform headquarters”. The large-scale transformations already at work were interrupted by the unexpected death of Henry II and the subsequent Wars of Religion. But continuity was inherent in the “spirit of the laws” of the Ancien Régime, so Spifame was able to predict future developments, including the creation of “chambers of annexation”.


2018 ◽  
Vol 9 (28) ◽  
pp. 6017-6034 ◽  
Author(s):  
Shunichi Fukuzumi ◽  
Yong-Min Lee ◽  
Hyun S. Ahn ◽  
Wonwoo Nam

This critical review discusses the thermal and photocatalytic mechanisms of one-, two-, four-, six- and eight-electron reduction of CO2 with metal complex catalysts.


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