Facile Synthesis of Iron Carbide via Pyrolysis of Ferrous Fumarate for Catalytic CO Hydrogenation to Lower Olefins.

Hydrogenation of CO to olefin catalyzed by iron-based catalysts is a sustainable and important way to achieve carbon neutrality. In this study, iron-based catalysts were facilely prepared by direct pyrolysis of ferric fumarate (FF), which are applied to CO hydrogenation to olefin reaction to explore the effects of pyrolysis temperature and atmosphere on catalytic performance of the catalysts. Among them, NaFe-Air-400 catalyst exhibits the highest catalytic activity with 33.

[Clinical and experimental study on the reattachment of fractured anterior teeth].

Objective: To evaluate the clinical results of three bonding patterns for the reattachment of anterior fractured teeth.

Methods: The reattachment of 59 anterior fractured teeth was performed using three bonding patterns, which were pattern A (pulp chamber concave + labial chamfer), pattern B (pulp chamber concave + lingual notch) and pattern C (pulp chamber concave + lingual notch + labial chamfer), and followed up for more than 24 months. Pattern A, B and C were 14 teeth, 14 teeth and 31 teeth, respectively.