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Hess's Law

Hess's Law

There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.

Free Energy Changes for Nonstandard States

Free Energy Changes for Nonstandard States

The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:

where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...

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Updated: Jul 10, 2025

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

Published on: October 2, 2012

Recent Advances in the Reverse Water-Gas Conversion Reaction.

Changjian Zhou¹, Jiahao Zhang¹, Yuqing Fu¹

¹School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, China.

Molecules (Basel, Switzerland)

|November 25, 2023

Summary

This review explores heterogeneous metal catalysts for the reverse water-gas shift (RWGS) reaction, a key method for converting abundant carbon dioxide into valuable products. It covers catalyst performance, mechanisms, and future research directions.

Keywords:

CO CO2 conversion catalyst design reverse water–gas conversion reaction

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Last Updated: Jul 10, 2025

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Area of Science:

Catalysis
Chemical Engineering
Environmental Science

Background:

Rising carbon dioxide emissions pose significant environmental and societal challenges.
Carbon dioxide is an abundant and cost-effective C1 resource for chemical synthesis.
The reverse water-gas shift (RWGS) reaction is a promising pathway for CO2 utilization.

Purpose of the Study:

To review research progress in heterogeneous metal catalysis for the RWGS reaction.
To analyze catalyst performance, thermodynamics, kinetics, and reaction mechanisms.
To provide insights into catalyst design and preparation for enhanced CO2 conversion.

Main Methods:

Comprehensive literature review of heterogeneous metal catalysts for RWGS.
Analysis of thermodynamic and kinetic data for various catalytic systems.
Examination of catalyst design principles and preparation techniques.

Main Results:

Heterogeneous metal catalysts show significant potential for efficient CO2 conversion via RWGS.
Understanding reaction mechanisms and kinetics is crucial for catalyst optimization.
Various catalyst design strategies can enhance performance and selectivity.

Conclusions:

Continued research in heterogeneous RWGS catalysis is vital for effective CO2 utilization.
Future work should focus on developing novel catalysts with improved stability and activity.
Advanced catalyst design and preparation methods will drive progress in CO2 conversion technologies.