Related Experiment Video
Updated: Aug 5, 2026
07:08
CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
Published on: June 12, 2019
Ti3+-O Acid-Base Pairs for Efficient Solar-Driven Photothermal Nonoxidative Ethane Dehydrogenation
Yuwen Sun1,2, Kun Gong1, Tianyu Li3
1Center of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai201210, China.
Journal of the American Chemical Society
|July 30, 2026
Summary
Noble metal-free catalysts with Ti3+-O acid-base pairs on reduced rutile TiO2 enable efficient solar-driven nonoxidative ethane dehydrogenation (NOEDH) for ethene production without external heating.
Area of Science:
- Catalysis
- Materials Science
- Photochemistry
Background:
- Nonoxidative ethane dehydrogenation (NOEDH) is a carbon-efficient route to ethene but requires severe thermodynamic conditions.
- Solar-driven NOEDH is a promising alternative, but achieving high activity and selectivity with noble metal-free catalysts without external heating is challenging.
Purpose of the Study:
- To develop a noble metal-free catalyst for efficient solar-driven nonoxidative ethane dehydrogenation (NOEDH) without external heating.
- To investigate the mechanism of enhanced catalytic activity and selectivity.
Main Methods:
- Synthesis of reduced rutile TiO2 with Ti3+-O acid-base pairs.
- Full-spectrum solar irradiation for photothermal NOEDH.
- Comprehensive characterizations including spectroscopy and kinetics analysis.
Main Results:
- Optimally reduced TiO2 exhibited an ethene production rate of 392.0 mmol g-1 h-1 with 94.9% selectivity, significantly outperforming pristine TiO2.
- Ti3+-O acid-base pairs enhanced light absorption, charge carrier separation, and C-H bond activation.
- Surface acid-base pairs facilitated product desorption and suppressed deep dehydrogenation and coke formation.
- Apparent activation energy was reduced from 157.6 kJ mol-1 in the dark to 75.0 kJ mol-1 under illumination.
Conclusions:
- Surface Ti3+-O acid-base pairs on reduced rutile TiO2 are effective for highly efficient solar-driven NOEDH without external heating.
- This approach offers a sustainable platform for light-driven alkane upgrading using noble metal-free catalysts.
Related Concept Videos
01:17Thermal Electrocyclic Reactions: Stereochemistry
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
01:26Photochemical Electrocyclic Reactions: Stereochemistry
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
02:13Reduction of Alkenes: Catalytic Hydrogenation
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
01:28Stability of Conjugated Dienes
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.