Scientific Papers & Presentations

Project Results at ASTEP Workshop

Project Results Presented at ASTEP Workshop 

Daniel Benitez
ASTEP Workshop
October 20th, 2022

Poster - Optimization of Spinel Absorber Coatings for CSP Particle Receivers

In order to improve the current commercial plants of concentrating solar power system (CSP), new system designs are being explored within the framework of COMPASsCO2 project to reach high temperatures. Solid particles are potential candidates to be used as receiver in CSP plants to increase their operating temperature (in order of 1000 °C) and efficiency, while can be also used as thermal storage medium. So, the integration of CSP particle systems into a highly efficiency-CO2 Brayton power cycle for electricity production is pursued. Different kinds of particles developed by Saint-Gobain have been coated with new developed coatings in order to ensure good optical properties and study their high temperatures and abrasion resistance. Solar absorptance values as high as 0.98 are obtained by applying 4 layers of porous black copper, manganese and iron spinel, heated at 1000ºC. A system to study abrasion processes by particle-particle collisions was also presented.

Farchado, R. Tordesillas, G. San Vicente, N. Germán, A. Morales

SolarPACES 2022
Albuquerque, NM, USA, September 27-30, 2022

COMPASsCO2 Results at ACHEMA 2022 Conference

COMPASsCO2 Results at ACHEMA 2022 Conference

Michael Kerbstadt
ACHEMA 2022 Conference
Frankfurt am Main, August 23rd, 2022

COMPASsCO2 Results at Processes4Planet Forum

COMPASsCO2 Results at Processes4Planet Forum

Maxime Rouzès
Processes4Planet Forum
Brussels, June 9th, 2022

Saint-Gobain's New Material Solutions for Thermal Energy Storage
The poster presentation developed and presented by Saint-Gobin CREE,one of the COMPASsCO2 project participants, at the 27th SolarPACES conference edition, which takes place online from September 27th to October 1st. The presentation gives an overview of all the thermal energy storage media manufactured by Saint-Gobain for CSP, ACAES and sensible heat applications, which includes preliminary results on development of granulated and fused particles in comparison to current state-of-the-art sintered bauxite. 

Samuel Marlin and Idris Amirouche
September 27th-October 1st, 2021

Presentation at SolarConcentra
General project presentation 

Daniel Benitez
November 11th, 2021

Presentation at sCO2-Flex Final Event

General project presentation 

Daniel Benitez
sCO2-Flex Final Event
June 16th, 2021

Improved Performance of Ceramic Solar Absorber Particles Coated with Black Oxide Pigment Deposited by Resonant Acoustic Mixing and Reaction Sintering

A deep-black Cu, Mn, Fe- pigment with a spinel structure was employed to coat standard proppants in order to improve long term solar absorptance. The coating process was performed by high-energy, high-speed mixing of proppants and small quantities of spinel powders in a resonant acoustic mixer. A continuous powder coating is achieved by electrostatic attraction between the proppant surface and the coating particles. Consolidation and strong attachment of the coating is achieved by the subsequent sintering beyond the spinel melting temperature. Chemical reaction and bonding between spinel coating and proppant lead to the incorporation of Al, Mg and Ti into the spinel structure. Coated bauxite proppants exhibit a significantly improved, long-term stable solar absorption accompanied by a promising abrasion resistance. The presented coating methodology is considered to be scalable to industrial production.

Gözde Alkan, Peter Mechnich and Johannes Pernpeintner
Coatings Journal
May 31th, 2022

Informative & Outreach Papers

COMPASsCO2 Poster – an overview of the project

The COMPASsCO2 poster gives a general overview of the COMPASsCO2 project, including addressed challenges, research focus (new particles and new metals alloys for the particle/sCO2 heat exchanger and their validation) as well as stakeholders engagement/dissemination and the composition of the consortium.


This article is a first of a series of informative papers aiming at disseminating the main achievements of COMPASsCO2 project to a wide audience, in order to increase awareness on sustainable energy technologies and highlight the efforts of both research and industry for the transition to a carbon neutral energy mix in Europe. It summarises the activities conducted in the first 18 months of implementation (November 2020 – April 2022), and the main accomplishments, with a specific focus on the development and testing of novel materials.